M. N. Belova
M. N. Belova. ʽMountain passesʼ with prefixes pre- and pro- in bulgarian and macedonian placenames and geographic terminology
Trudy IRY RAS. 2018. № 4 (18), Pages. 23 - 33
M. N. Belova. THE BIRD patica IN BULGARIAN
Trudy IRY RAS. 2015. № 1 (4), Pages. 59 - 69