array(3) {
  [0]=>
  int(4415)
  [1]=>
  string(148) "Ugarte S., Artiba A., et al. Manufacturing execution system - a literature review. Production Planning & Control, 2009, vol. 20, no. 6, pp. 525-539."
  [2]=>
  int(1)
}
<h1>DB Error 230: Duplicate entry '4415-1' for key 'citations.citations_submission_seq'</h1>