@base . a ; "1314-0744" ; . "Bulgaria" . a ; "1314-0744" ; . a ; ; "20210206224900.0"^^ ; ; . a . a ; . a , , ; , , ; "International Electronic Journal of Pure and Applied Mathematics." ; ; ; "1314-0744" ; ; "1314-0744" ; ; "1314-0744" ; "International Electronic Journal of Pure and Applied Mathematics" , "International Electronic Journal of Pure and Applied Mathematics." ; ; "http://www.e.ijpam.eu/index.html" . . a , ; "International Electronic Journal of Pure and Applied Mathematics" .