array(3) {
  [0]=>
  int(15323)
  [1]=>
  string(184) "Measures of distance between samples: Euclidean [Электронный ресурс] - Режим доступа: URL: http://www.econ.upf.edu/~michael/stanford/maeb4.pdf (26.11.2021)"
  [2]=>
  int(8)
}
<h1>DB Error 230: Duplicate entry '15323-8' for key 'citations.citations_submission_seq'</h1>