array(3) {
  [0]=>
  int(17921)
  [1]=>
  string(227) "Post-Quantum Cryptography. 16-th International Conference, PQCrypto 2025, Taipei, Taiwan, April 8–10, 2025. Proceedings, Part I // Lecture Notes in Computer Science. Springer. 2023. vol. 15577. DOI: 10.1007/978-3-031-86599-2."
  [2]=>
  int(1)
}
<h1>DB Error 230: Duplicate entry '17921-1' for key 'citations.citations_submission_seq'</h1>