THE MUNICIPALITY OF SOFIA
Ordinance for the Advertising Activities on the Territory of the Municipality of Sofia
Promulgated in the Information Bulletin of the Municipality of Sofia, No. 2, June 1996
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Article 7
All texts in the sphere of public advertising, inscriptions and the information tables should be written in the Bulgarian language with the exception of trade marks or company signs (logo) of enterprises of a renown international reputation.
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Source: Unofficial translation