@base . a ; "2460-4453" ; . a ; . a , , ; , , ; "Journal of natural sciences and mathematics research." ; ; ; ; "2460-4453" ; ; ; "2460-4453" ; ; "2460-4453" ; "Journal of natural sciences and mathematics research." , "Journal of natural sciences and mathematics research (Online)" ; ; "http://journal.walisongo.ac.id/index.php/NSMR" . . a ; "2460-4453" ; . "Indonesia" . a , ; "Journal of natural sciences and mathematics research (Online)" . a . a ; ; "20210206220500.0"^^ ; ; .