Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
Bulgarian [bʌlˈgɛərɪən] adj болга́рский#
n (person) болга́рин*-рка#] (LING) болга́рский*язы́к#
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.
Русский: