array(3) {
  [0]=>
  int(4367)
  [1]=>
  string(114) "Ziegler J. G., Nichols N. B. Optimum Settings for Automatic Controllers // Trans. ASME. 1942. Vol. 64. P. 759-768."
  [2]=>
  int(1)
}
<h1>DB Error 230: Duplicate entry '4367-1' for key 'citations.citations_submission_seq'</h1>