(setq keys (org-ref-split-and-strip-string link-string))
(setq years (mapcar 'org-ref-get-citation-year keys))
(setq data (mapcar* (lambda (a b) `(,a . ,b)) years keys))
- (setq data (cl-sort data (lambda (x y) (< (string-to-int (car x)) (string-to-int (car y))))))
+ (setq data (cl-sort data (lambda (x y) (< (string-to-number (car x)) (string-to-number (car y))))))
;; now get the keys separated by commas
(setq keys (mapconcat (lambda (x) (cdr x)) data ","))
;; and replace the link with the sorted keys