array(3) {
  [0]=>
  int(15821)
  [1]=>
  string(244) "Shen X., Wang G., Wang Y. The influence of research reports on stock returns: The mediating effect of machine-learning-based investor sentiment // Discrete Dynamics in Nature and Society. 2021. vol. 2021. no. 5049179. DOI: 10.1155/2021/5049179."
  [2]=>
  int(15)
}
<h1>DB Error 230: Duplicate entry '15821-15' for key 'citations.citations_submission_seq'</h1>