Keyword: 21st century
Fidele Ukobizaba, Gabriel Nizeyimana, Angel Mukuka
EURASIA J Math Sci Tech Ed, Volume 17, Issue 3, Article No: em1945
Yan Wang, Jari Lavonen, Kirsi Tirri
EURASIA J Math Sci Tech Ed, Volume 14, Issue 6, pp. 2081-2095
Jorge C Sanabria, Jesús Arámburo-Lizárraga
EURASIA J Math Sci Tech Ed, Volume 13, Issue 2, pp. 487-501