URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::b6025dc932976ad2c3d5e3852b14c0b5https://doi.org/10.1142/s1793840611002334
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::997c2e42542b59d4eac5e5e9b41545bfhttps://doi.org/10.1142/s1793840608001780