BULGARIA - PENAL PROCEDURE CODE
Part one. GENERAL RULES
Chapter one. TASKS AND LIMITS OF EFFECT
Art 2. (2) The Penal Procedure Code shall also apply in the cases of performing court orders of another country, placed by virtue of an agreement or under the terms of reciprocity.
National procedures for execution of cooperation request
Cooperation of State
International assistance in criminal matters
Availability of procedures under national law
Cooperation under procedures of national law
EDIT.