Some articles on collating:

Alphabetize - Ordering in The Latin Alphabet - Language-specific Conventions
... Czech and Slovak, accented vowels have secondary collating weight – compared to other letters, they are treated as their unaccented forms (A-Á, E-É-Ě, I-Í, O-Ó-Ô, U-Ú-Ů, Y-Ý), but ... Accented consonants (the ones with caron) have primary collating weight and are collocated immediately after their unaccented counterparts, with exception of ... orthography also includes spelling.) The Finnish alphabet and collating rules are the same as those of Swedish ...