BULGARIA - PENAL PROCEDURE CODE
Part one. GENERAL RULES
Chapter one. TASKS AND LIMITS OF EFFECT
Art. 4. (1) Penal proceeding instituted by a body of another country, or the effective sentence passed by a court of another country, and not recognized under the order of this code, shall not be an obstacle to the institution of penal proceedings by the authorities of the Republic of Bulgaria regarding the same crime and against the same person.
(2) (amend. – SG 15/10) The effective sentence passed by a court of another country and not recognised under the order of the Bulgarian legislation shall not be subject to execution by the authorities of the Republic of Bulgaria.
(3) The provisions of Para 1 and Para 2 shall not apply, if stipulated otherwise in an international treaty to which the Republic of Bulgaria is a party, which has been ratified, promulgated and has entered into force.
EDIT.