array(3) {
  [0]=>
  int(15615)
  [1]=>
  string(140) "Burkart N., Huber M.F. A survey on the explainability of supervised machine learning // J. Artif. Intell. Res. 2021. vol. 70. pp. 245–317."
  [2]=>
  int(1)
}
<h1>DB Error 230: Duplicate entry '15615-1' for key 'citations.citations_submission_seq'</h1>