array(3) {
  [0]=>
  int(15049)
  [1]=>
  string(159) "Takano M.I., Nagano M.S. A branch-and bound method to minimize the makespan in a permutation flow shop with blocking and setup times. Cogent Engineering. 2017."
  [2]=>
  int(15)
}
<h1>DB Error 230: Duplicate entry '15049-15' for key 'citations.citations_submission_seq'</h1>