diff --git a/DESCRIPTION b/DESCRIPTION
index 9b1faab..3295290 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,8 +1,8 @@
 Package: readJDX
 Type: Package
 Title: Import Data in the JCAMP-DX Format
-Version: 0.6.2
-Date: 2023-11-16
+Version: 0.6.4
+Date: 2023-11-18
 Authors@R: person(
     "Bryan A.", "Hanson",
     role = c("aut", "cre"),
diff --git a/NEWS.md b/NEWS.md
index e9293db..cba10cb 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,6 +1,7 @@
-# readJDX 0.6.3 (2023-11-16)
+# readJDX 0.6.4 (2023-11-18)
 ## Behind the Scenes
-* Fixed a problem with a deprecation of the LaTeX package `usenames` which is no longer used by the LaTeX package `xcolor`, used in the vignettes.
+* Fixed a problem due to deprecation of the LaTeX package `usenames` which is no longer used by the LaTeX package `xcolor`, used in the vignettes.  Notified by B. Ripley/CRAN.
+* Updated and repaired some URLs in bibliography.
 
 # readJDX 0.6.2 (2022-12-19)
 ## Behind the Scenes
diff --git a/vignettes/JCAMP-DX.bib b/vignettes/JCAMP-DX.bib
index e4c0401..b7c7b2e 100644
--- a/vignettes/JCAMP-DX.bib
+++ b/vignettes/JCAMP-DX.bib
@@ -19,7 +19,7 @@ @article{ Woollett2012
 Volume = {{84}},
 Number = {{10}},
 Pages = {{2171-2182}},
-URL = {{www.doi.org/10.1351/PAC-REC-12-02-03}},
+URL = {https://www.degruyter.com/document/doi/10.1351/PAC-REC-12-02-03/html},
 ISSN = {{0033-4545}}
 }
 
@@ -33,7 +33,7 @@ @article{ Cammack2006
 Number = {{3}},
 Pages = {{613-631}},
 Month = {{MAR}},
-URL = {{www.doi.org/10.1351/pac200678030613}},
+URL = {https://www.degruyter.com/document/doi/10.1351/pac200678030613/html},
 ISSN = {{0033-4545}}
 }
 
@@ -47,7 +47,7 @@ @article{ Bumbach2001
 Number = {{11}},
 Pages = {{1765-1782}},
 Month = {{NOV}},
-URL = {{www.doi.org/10.1351/pac200173111765}},
+URL = {https://www.degruyter.com/document/doi/10.1351/pac200173111765/html},
 ISSN = {{0033-4545}}
 }
 
@@ -62,7 +62,7 @@ @article{ Lampen1999
 Number = {{8}},
 Pages = {{1549-1556}},
 Month = {{AUG}},
-URL = {{www.doi.org/10.1351/pac199971081549}},
+URL = {https://www.degruyter.com/document/doi/10.1351/pac199971081549/html},
 ISSN = {{0033-4545}}
 }
 
@@ -87,7 +87,7 @@ @article{ Davies1993
 Number = {{8}},
 Pages = {{1093-1099}},
 Month = {{AUG}},
-URL = {{www.doi.org/10.1366/0003702934067874}},
+Note = {{https://journals.sagepub.com/doi/10.1366/0003702934067874}},
 ISSN = {{0003-7028}}
 }
 
@@ -100,7 +100,7 @@ @article{ Grasselli1991
 Number = {{12}},
 Pages = {{1781-1792}},
 Month = {{DEC}},
-URL = {{www.doi.org/10.1351/pac199163121781}},
+URL = {https://www.degruyter.com/document/doi/10.1351/pac199163121781/html},
 ISSN = {{0033-4545}}
 }
 
@@ -113,6 +113,17 @@ @article{ McDonald1988
 Number = {{1}},
 Pages = {{151-162}},
 Month = {{JAN}},
-URL = {{www.doi.org/10.1351/pac199163121781}},
+Note = {{https://journals.sagepub.com/doi/10.1366/0003702884428734}},
 ISSN = {{0003-7028}}
 }
+@article{Davies2022,
+  title = {An overview of the JCAMP-DX format},
+  author = {Antony N. Davies and Robert M. Hanson and Peter Lampen and Robert J. Lancashire},
+  pages = {705--723},
+  volume = {94},
+  number = {6},
+  journal = {Pure and Applied Chemistry},
+  Url = {https://www.degruyter.com/document/doi/10.1515/pac-2021-2010/html},
+  year = {2022},
+}
+
diff --git a/vignettes/readJDX.Rmd b/vignettes/readJDX.Rmd
index ae78b53..8fbdf2c 100644
--- a/vignettes/readJDX.Rmd
+++ b/vignettes/readJDX.Rmd
@@ -39,7 +39,7 @@ This vignette is based on `readJDX` version `r desc$Version`.
 
 # Background
 
-The JCAMP-DX format was developed as an manufacturer-independent means of sharing spectroscopic [data](http://www.jcamp-dx.org).  The standard is described in a series of publications [@McDonald1988; @Grasselli1991; @Davies1993; @Lampen1994; @Lampen1999;  @Bumbach2001; @Cammack2006; @Woollett2012].  JCAMP-DX was developed during a time when data storage was expensive, and hence makes extensive use of compression schemes.  The original application was to IR spectroscopy, but the standard has evolved over time to accommodate other spectroscopies.
+The JCAMP-DX format was developed as an manufacturer-independent means of sharing spectroscopic [data](http://www.jcamp-dx.org).  The standard is described in a series of publications [@McDonald1988; @Grasselli1991; @Davies1993; @Lampen1994; @Lampen1999;  @Bumbach2001; @Cammack2006; @Woollett2012].  There is a recent overview of the standard [@Davies2022]. JCAMP-DX was developed during a time when data storage was expensive, and hence makes extensive use of compression schemes.  The original application was to IR spectroscopy, but the standard has evolved over time to accommodate other spectroscopies.
 
 # File Structure