diff --git a/bib/drought_ref.bib b/bib/drought_ref.bib
index 1439bd4..df5d2ef 100644
--- a/bib/drought_ref.bib
+++ b/bib/drought_ref.bib
@@ -10,7 +10,7 @@ @article{Anderson2017
    type = {Journal Article}
 }
 
-@article{RN5451,
+@article{Abatzoglou2018,
    author = {Abatzoglou, John T and Dobrowski, Solomon Z and Parks, Sean A and Hegewisch, Katherine C},
    title = {TerraClimate, a high-resolution global dataset of monthly climate and climatic water balance from 1958–2015},
    journal = {Scientific data},
@@ -18,6 +18,19 @@ @article{RN5451
    pages = {170191},
    ISSN = {2052-4463},
    year = {2018},
+   doi = {https://doi.org/10.1038/sdata.2017.191},
+   type = {Journal Article}
+}
+
+@article{Blaylock1976,
+   author = {Blaylock, Lynn A and Ruibal, Rodolfo and Platt-Aloia Kathryn},
+   title = {Skin structure and wiping behavior of phyllomedusine frogs},
+   journal = {Copeia},
+   volume = {1976},
+   number = {2},
+   pages = {283-295},
+   doi = {https://doi.org/10.2307/1443948},
+   year = {1976},
    type = {Journal Article}
 }
 
@@ -33,6 +46,18 @@ @article{Baldwin1974
    type = {Journal Article}
 }
 
+@article{Bovo2023,
+   author = {Bovo, Rafeal P and Simon, M N and Lyra, M L and Navas, C A and Andrade, D V},
+   title = {Beyond Janzen's hypothesis: How amphibians that climb tropical mountains respond to climate variation},
+   journal = {Integrative Organismal Biology},
+   volume = {5},
+   number = {1},
+   pages = {obad009},
+   doi = {https://doi.org/10.1093/iob/obad009},
+   year = {2023},
+   type = {Journal Article}
+}
+
 @article{Budyko1961,
    author = {Budyko, Mikhail Ivanovich},
    title = {The heat balance of the earth's surface},
@@ -46,6 +71,18 @@ @article{Budyko1961
    type = {Journal Article}
 }
 
+@article{Buttemer2003,
+   author = {Buttemer, William A and Thomas, Craig},
+   title = {Influence of temperature on evaporative water loss and cutaneous resistance to water vapour diffusion in the orange-thighed frog ({\emph{Litoria xanthomera}})},
+   journal = {Australian Journal of Zoology},
+   volume = {51},
+   number = {2},
+   pages = {111-118},
+   doi = {https://doi.org/10.1071/ZO02057},
+   year = {2003},
+   type = {Journal Article}
+}
+
 @book{RN5448,
    author = {Cherlet, M. and Hutchinson, C. and Reynolds, J. and Hill, J. and Sommer, S. and von Maltitz, G.},
    title = {World atlas of desertification},
@@ -57,7 +94,7 @@ @book{RN5448
    type = {Book}
 }
 
-@article{RN5450,
+@article{Dai2004,
    author = {Dai, Aiguo and Trenberth, Kevin E and Qian, Taotao},
    title = {A global dataset of Palmer Drought Severity Index for 1870–2002: Relationship with soil moisture and effects of surface warming},
    journal = {Journal of Hydrometeorology},
@@ -69,6 +106,19 @@ @article{RN5450
    type = {Journal Article}
 }
 
+@article{Eyring2016,
+   author = {Eyring, Veronika and Bony, Sandrine and Meehl, Gerald A and Senior, Catherine A and Stevens, Bjorn and Stouffer, Ronald J and Taylor, Karl E},
+   title = {Overview of the Coupled Model Intercomparison Project Phase 6 (CMIP6) experimental design and organization},
+   journal = {Geoscientific Model Development},
+   volume = {9},
+   number = {5},
+   pages = {1937-1958},
+   ISSN = {1991-959X},
+   doi = {https://doi.org/10.5194/gmd-9-1937-2016},
+   year = {2016},
+   type = {Journal Article}
+}
+
 @book{Feder1992,
    author = {Feder, Martin E and Burggren, Warren W},
    title = {Environmental physiology of the amphibians},
@@ -79,6 +129,18 @@ @book{Feder1992
    type = {Book}
 }
 
+@article{Gomez2006,
+   author = {Gomez, Nadia A and Acosta, Michelle and Zaidan III, Fredric and Lillywhite, Harvey B},
+   title = {Wiping behavior, skin resistance, and the metabolic response to dehydration in the arboreal frog {\emph{Phyllomedusa hypochondrialis}}},
+   journal = {Current Biology},
+   volume = {79},
+   number = {6},
+   pages = {1058-1068},
+   doi = {https://doi.org/10.1086/507659},
+   year = {2006},
+   type = {Journal Article}
+}
+
 @article{RN5453,
    author = {González-del-Pliego, Pamela and Freckleton, Robert P and Edwards, David P and Koo, Michelle S and Scheffers, Brett R and Pyron, R Alexander and Jetz, Walter},
    title = {Phylogenetic and trait-based prediction of extinction risk for data-deficient amphibians},
@@ -91,6 +153,18 @@ @article{RN5453
    type = {Journal Article}
 }
 
+@article{Gouveia2019,
+   author = {Gouveia, Sidney F and Rafael, Rafael P and Rubalcaba, Juan G and Da Silva, Fernando Rodrigues and Maciel, Natan M and Andrade, Denis V and Martinez, Pablo Ariel},
+   title = {Biophysical modeling of water economy can explain geographic gradient of body size in anurans},
+   journal = {The American Naturalist},
+   volume = {193},
+   number = {1},
+   pages = {51-58},
+   doi = {https://doi.org/10.1086/700833},
+   year = {2019},
+   type = {Journal Article}
+}
+
 @book{Hillman2009,
    author = {Hillman, Stanley S and Withers, Philip C and Drewes, Robert C and Hillyard, Stanley D},
    title = {Ecological and environmental physiology of amphibians},
@@ -143,6 +217,18 @@ @article{Kearney2008
    type = {Journal Article}
 }
 
+@article{Kearney2014,
+   author = {Kearney, Michael R and Shamakhy, Alireza and Tingley, Reid and Karoly, David J. and Hoffmann, Ary A. and Briggs, Peter R. and Porter, Warren P},
+   title = {Microclimate modelling at macro scales: a test of a general microclimate model integrated with gridded continental‐scale soil and weather data},
+   journal = {Methods in Ecology and Evolution},
+   volume = {5},
+   number = {3},
+   pages = {273-286},
+   doi = {https://doi.org/10.1111/2041-210X.12148},
+   year = {2014},
+   type = {Journal Article}
+}
+
 @article{Kearney2017,
    author = {Kearney, Michael R and Porter, Warren P},
    title = {{NicheMapR}–an {R} package for biophysical modelling: the microclimate model},
@@ -180,6 +266,17 @@ @article{Klein2016
    type = {Journal Article}
 }
 
+@article{Kobelt1986,
+   author = {Kobelt, Frank and Linsenmair, K. E.},
+   title = {Adaptations of the reed frog {\emph{Hyperolius viridiflavus}} (Amphibia, Anura, Hyperoliidae) to its arid environment I. The skin of {\emph{Hyperolius viridiflavus nitidulus}} in wet and dry season conditions},
+   journal = {Oecologia},
+   volume = {68},
+   pages = {533-541},
+   doi = {https://doi.org/10.1007/BF00378768},
+   year = {1986},
+   type = {Journal Article}
+}
+
 @article{Lillywhite2006,
    author = {Lillywhite, Harvey B},
    title = {Water relations of tetrapod integument},
@@ -252,6 +349,16 @@ @book{Palmer1965
    type = {Book}
 }
 
+@inbook{Pirtle2019,
+  author    = {Pirtle, Elia I. and Tracy, Christopher R. and Kearney, Michael, R},
+  title     = {Hydroregulation: A neglected behavioral response of lizards to climate change?},
+  booktitle = {Behavior of lizards},
+  year      = {2019},
+  publisher = {CRC Press},
+  address   = {New York, USA},
+  pages     = {343-374}
+}
+
 @article{Riddell2017,
    author = {Riddell, Eric A and Apanovitch, Evan K and Odom, Jonathan P and Sears, Michael W},
    title = {Physical calculations of resistance to water loss improve predictions of species range models},
@@ -425,7 +532,7 @@ @article{Withers1984
 
 @article{Withers1995,
    author = {Withers, Philip C},
-   title = {{Cocoon formation and structure in the estivating Australian desert frogs, Neobatrachus and Cyclorana}},
+   title = {Cocoon formation and structure in the estivating Australian desert frogs, Neobatrachus and Cyclorana},
    journal = {Australian Journal of Zoology},
    volume = {43},
    number = {5},
@@ -436,6 +543,19 @@ @article{Withers1995
    type = {Journal Article}
 }
 
+@article{Zhao2022,
+   author = {Zhao, Tianbao and Dai, Aiguo},
+   title = {CMIP6 model-projected hydroclimatic and drought changes and their causes in the twenty-first century},
+   journal = {Journal of Climate},
+   volume = {35},
+   number = {3},
+   pages = {897-921},
+   ISSN = {0894-8755},
+   doi = {https://doi.org/10.1175/JCLI-D-21-0442.1},
+   year = {2022},
+   type = {Journal Article}
+}
+