Insert markdown (pandoc-citeproc) formatted citations using RefTeX

reftex-markdown.el

;; reftex in markdown mode

;; if this isn't already set in your .emacs
(setq reftex-default-bibliography '("/path/to/library.bib"))

;; define markdown citation formats
(defvar markdown-cite-format)
(setq markdown-cite-format
      '(
        (?\C-m . "[@%l]")
        (?p . "[@%l]")
        (?t . "@%l")
        )
      )

;; wrap reftex-citation with local variables for markdown format
(defun markdown-reftex-citation ()
  (interactive)
  (let ((reftex-cite-format markdown-cite-format)
        (reftex-cite-key-separator "; @"))
    (reftex-citation)))

;; bind modified reftex-citation to C-c[, without enabling reftex-mode
;; https://www.gnu.org/software/auctex/manual/reftex/Citations-Outside-LaTeX.html#SEC31
(add-hook
 'markdown-mode-hook
 (lambda ()
   (define-key markdown-mode-map "\C-c[" 'markdown-reftex-citation)))

Thanks for sharing. Would this solution be able to allow to insert several citations in one shot? I see the code referring to key-separator, but I am not being able to make it work. I am very new to Emacs, so it will probably be my fault, but I wanted to make sure nonetheless.