@base . a ; "0001-351X" ; . "Bulgaria" . a ; . a . a , ; "Abstracts of Bulgarian scientific literature. Mathematics, Physics, Astronomy, Geophysics, Geodesy" . , ; "Abstracts of Bulgarian scientific literature." ; ; ; ; ; "Abstracts of Bulgarian scientific literature. Mathematics, Physics, Astronomy, Geophysics, Geodesy" , "Abstracts of Bulgarian scientific literature." ; . . a ; "20230508171855.752091"^^ ; ; .