This is BibTeX, Version 0.99d (TeX Live 2018) Capacity: max_strings=100000, hash_size=100000, hash_prime=85009 The top-level auxiliary file: citati.aux Case mismatch error between cite keys Bauer06 and bauer06 ---line 25 of file citati.aux : \citation{Bauer06 : } I'm skipping whatever remains of this command The style file: plain.bst Database file #1: literatura.bib You've used 5 entries, 2118 wiz_defined-function locations, 528 strings with 4654 characters, and the built_in function-call counts, 1219 in all, are: = -- 123 > -- 35 < -- 0 + -- 16 - -- 10 * -- 63 := -- 223 add.period$ -- 16 call.type$ -- 5 change.case$ -- 17 chr.to.int$ -- 0 cite$ -- 5 duplicate$ -- 55 empty$ -- 108 format.name$ -- 10 if$ -- 248 int.to.chr$ -- 0 int.to.str$ -- 5 missing$ -- 6 newline$ -- 29 num.names$ -- 10 pop$ -- 21 preamble$ -- 1 purify$ -- 15 quote$ -- 0 skip$ -- 32 stack$ -- 0 substring$ -- 67 swap$ -- 5 text.length$ -- 0 text.prefix$ -- 0 top$ -- 0 type$ -- 16 warning$ -- 0 while$ -- 14 width$ -- 6 write$ -- 58 (There was 1 error message)