Update citation information

inst/CITATION

@@ -1,19 +1,17 @@
 citHeader("To cite xpose4 in publications, use:")
 
-citEntry(
- entry="Article",
- title= "Xpose--an S-PLUS based population pharmacokinetic/pharmacodynamic model building aid for NONMEM",
- journal="Computer Methods and Programs in Biomedicine",
- volume= "58",
- number="1",
- pages="51-64",
- year="1999",
- author = personList(as.person("E. N. Jonsson"), 
-                     as.person("M. O. Karlsson")),
- doi = "10.1016/s0169-2607(98)00067-4",
- textVersion="Jonsson, E.N. & Karlsson, M.O. (1999) Xpose--an S-PLUS based population 
- pharmacokinetic/pharmacodynamic model building aid for NONMEM. Computer Methods
- and Programs in Biomedicine. 58(1):51-64."
+bibentry(
+  bibtype="Article",
+  title= "Xpose--an S-PLUS based population pharmacokinetic/pharmacodynamic model building aid for NONMEM",
+  author = c(person(c("E"," Niclas"), "Jonsson"), 
+             person(c("Mats","O"), "Karlsson")),
+  journal="Computer Methods and Programs in Biomedicine",
+  volume= "58",
+  number="1",
+  pages="51-64",
+  year="1999",
+  doi = "10.1016/s0169-2607(98)00067-4",
+  textVersion="Jonsson, E.N. & Karlsson, M.O. (1999) Xpose--an S-PLUS based population pharmacokinetic/pharmacodynamic model building aid for NONMEM. Computer Methods and Programs in Biomedicine. 58(1):51-64."
 )
 
 bibentry(bibtype="Article",