Differential equations 由 Leopando, Gabriel A., Ramos, Frederick O., Berico, Edwin O., Oliquino, Audie B., Gedaria, Carlito V., Corderro, Marcelino S., Diona, Myrna G., Isaac, Emelita A., Torres, Aureluz, L., Publico, Juan L., Jr, Fadrigalan, Catalina M., Batongbakal, Amalia D.R