array(3) {
  [0]=>
  int(4169)
  [1]=>
  string(126) "Lippmann R. P. Validating and Restoring Defense in Depth using Attack Graphs // Proc. of MILCOM 2006. Washington, DC. P. 1-10."
  [2]=>
  int(2)
}
<h1>DB Error 230: Duplicate entry '4169-2' for key 'citations.citations_submission_seq'</h1>