array(3) {
  [0]=>
  int(3718)
  [1]=>
  string(119) "Tang X., Wang X. Face sketch recognition // IEEE Trans. Circuits Syst. Video Technol. 2004. Vol. 14, № 1. P. 50–57."
  [2]=>
  int(6)
}
<h1>DB Error 230: Duplicate entry '3718-6' for key 'citations.citations_submission_seq'</h1>