array(3) {
  [0]=>
  int(4030)
  [1]=>
  string(288) "Liu C., Coombes M., Li B., Chen W-H. Enhanced situation awareness for unmanned aerial vehicle operating in terminal areas with circuit flight rules // Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering. 2016. vol. 230. no. 9. pp. 1683–1693."
  [2]=>
  int(25)
}
<h1>DB Error 230: Duplicate entry '4030-25' for key 'citations.citations_submission_seq'</h1>