array(3) {
  [0]=>
  int(15661)
  [1]=>
  string(99) "Tatiya R. Civil excavations and tunnelling: a practical guide. London: Thomas Telford, 2005. 322 p."
  [2]=>
  int(1)
}
<h1>DB Error 230: Duplicate entry '15661-1' for key 'citations.citations_submission_seq'</h1>