array(3) {
  [0]=>
  int(17421)
  [1]=>
  string(251) "Ronneberger O., Fischer P., Brox T. U-net: Convolutional networks for biomedical image segmentation // Proceedings of the 18th international conference Medical image computing and computer-assisted intervention (MICCAI), part III. 2015. pp. 234–241."
  [2]=>
  int(40)
}
<h1>DB Error 230: Duplicate entry '17421-40' for key 'citations.citations_submission_seq'</h1>