array(3) { [0]=> int(15323) [1]=> string(184) "Measures of distance between samples: Euclidean [Электронный ресурс] - Режим доступа: URL: http://www.econ.upf.edu/~michael/stanford/maeb4.pdf (26.11.2021)" [2]=> int(8) }

DB Error 230: Duplicate entry '15323-8' for key 'citations.citations_submission_seq'