This is BibTeX, Version 0.99d (TeX Live 2019 Gentoo Linux) Capacity: max_strings=100000, hash_size=100000, hash_prime=85009 The top-level auxiliary file: prova.aux I found no \citation commands---while reading file prova.aux I found no \bibdata command---while reading file prova.aux I found no \bibstyle command---while reading file prova.aux You've used 0 entries, 0 wiz_defined-function locations, 83 strings with 484 characters, and the built_in function-call counts, 0 in all, are: = -- 0 > -- 0 < -- 0 + -- 0 - -- 0 * -- 0 := -- 0 add.period$ -- 0 call.type$ -- 0 change.case$ -- 0 chr.to.int$ -- 0 cite$ -- 0 duplicate$ -- 0 empty$ -- 0 format.name$ -- 0 if$ -- 0 int.to.chr$ -- 0 int.to.str$ -- 0 missing$ -- 0 newline$ -- 0 num.names$ -- 0 pop$ -- 0 preamble$ -- 0 purify$ -- 0 quote$ -- 0 skip$ -- 0 stack$ -- 0 substring$ -- 0 swap$ -- 0 text.length$ -- 0 text.prefix$ -- 0 top$ -- 0 type$ -- 0 warning$ -- 0 while$ -- 0 width$ -- 0 write$ -- 0 (There were 3 error messages)