Name headings with post-positional articles should be based on usage. Do not make a reference for the form without the article. RI22.3A, no. 1

Examples:
040 DLC‡cDLC
110 20 Seslavskata tsurkva
410 10 Seslavtsi, Bulgaria.‡bTsćurkva
550 0 ‡wnb‡aChurches‡zBulgaria
551 0 ‡wnb‡aSeslavtsi, Bulgaria‡xChurches
670 Kamenova, D. Seslavskata tsurkva, 1977 (subj.)‡bt.p. (Seslavskata tsurkva)
670 Bu 77-2892‡b(Seslavskata tsurkva)
675 Kratka bulg. ents., 1969. NAFL7842056

Note:

The following heading is an exception and is not justified by the 670's.

040 CtY‡cCtY‡dDLC‡dCtY‡dNjP
110 20 Boianska tsurkva
410 20 Boiana (Bulgaria).‡bBoianska tsurkva
410 20 Boěanskata tsurkva
410 20 Boiana (Bulgaria).‡bBoianskata tsurkva
410 20 Kirche von Bojana (Bulgaria)
410 20 Boyana church (Bulgaria)
670 NUC58-24278 :‡b(hdg.: Boianska tsurkva; usage: Boianskata tsurkva)
670 Stoikov, G. I. Die Kirche von Bojana, 1954.
670 Stoikov, G. I. Boyana church, 1954. NAFR9144373