array(3) {
  [0]=>
  int(4401)
  [1]=>
  string(94) "Goodman J. W. Introduction to Fourier Optics. - Roberts and Company Publishers, 2005. - 491 p."
  [2]=>
  int(1)
}
<h1>DB Error 230: Duplicate entry '4401-1' for key 'citations.citations_submission_seq'</h1>