fix references to DOIs (see #71)

DESCRIPTION

@@ -12,8 +12,8 @@ Maintainer: Andreas Beger <adbeger@gmail.com>
 Description: Download the Integrated Crisis Early Warning System (ICEWS) event 
     data from Dataverse and keep it synced with the latest updates. Store the 
     local data using either the raw tab-separated files, in a SQLite database, 
-    or both. The ICEWS dataverse repos are <https://doi.org/10.7910/DVN/28075> 
-    and <https://doi.org/10.7910/DVN/QI2T9A>
+    or both. The ICEWS dataverse repos are <doi:10.7910/DVN/28075> and 
+    <doi:10.7910/DVN/QI2T9A>.
 License: MIT + file LICENSE
 URL: https://www.andybeger.com/icews/,
     https://github.com/andybega/icews

R/data-docs.R

@@ -35,9 +35,9 @@ get_doi <- function() {
 #' }
 #'
 #' @source
-#' <http://eventdata.parusanalytics.com/data.dir/cameo.html>
+#' \url{http://eventdata.parusanalytics.com/data.dir/cameo.html}
 #'
-#' <https://doi.org/10.7910/DVN/28075>
+#' \doi{10.7910/DVN/28075}
 #'
 "cameo_codes"
 
@@ -47,9 +47,9 @@ get_doi <- function() {
 #' List mapping CAMEO codes to Goldstein scores
 #'
 #' @source
-#' <http://eventdata.parusanalytics.com/data.dir/cameo.html>
+#' \url{http://eventdata.parusanalytics.com/data.dir/cameo.html}
 #'
-#' <https://doi.org/10.7910/DVN/28075>
+#' \doi{10.7910/DVN/28075}
 #'
 #' @examples
 #' data(goldstein_mappings)
@@ -62,7 +62,7 @@ get_doi <- function() {
 #' 3 June 2018.
 #'
 #' @source
-#' <https://doi.org/10.7910/DVN/28075>
+#' \doi{10.7910/DVN/28075}
 #'
 #' @examples
 #' data("icews_sample")

R/icews-package.R

@@ -31,13 +31,11 @@
 #' @references
 #'   Boschee, Elizabeth; Lautenschlager, Jennifer; O'Brien, Sean;
 #'   Shellman, Steve; Starz, James; Ward, Michael, 2015, ``ICEWS Coded
-#'   Event Data'', [https://doi.org/10.7910/DVN/28075](https://doi.org/10.7910/DVN/28075),
-#'   Harvard Dataverse.
+#'   Event Data'', \doi{10.7910/DVN/28075}, Harvard Dataverse.
 #'
 #'   Boschee, Elizabeth; Lautenschlager, Jennifer; O'Brien, Sean; Shellman,
 #'   Steve; Starz, James, 2018, ``ICEWS Weekly Event Data'',
-#'   [https://doi.org/10.7910/DVN/QI2T9A](https://doi.org/10.7910/DVN/QI2T9A),
-#'   Harvard Dataverse.
+#'   \doi{10.7910/DVN/QI2T9A}, Harvard Dataverse.
 #'
 #'
 #' @name icews