array(3) {
  [0]=>
  int(15409)
  [1]=>
  string(162) "Madisetti V.K. The Digital Signal Processing Handbook, Second edition: Digital Signal Processing Fundamentals // CRC Press, Taylor and Francis Group. 2010. 904 p."
  [2]=>
  int(1)
}
<h1>DB Error 230: Duplicate entry '15409-1' for key 'citations.citations_submission_seq'</h1>