Rubin, RL. (1982). Mathematical model formulation
. INTERNATIONAL JOURNAL OF MATHEMATICAL EDUCATION IN SCIENCE AND TECHNOLOGY, 13(6), 725-734. 10.1080/0020739820130606
Rubin, RL. (1982). Mathematical model formulation
. INTERNATIONAL JOURNAL OF MATHEMATICAL EDUCATION IN SCIENCE AND TECHNOLOGY, 13(6), 725-734. 10.1080/0020739820130606