Differential equations gan 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