Legara, E.F., Juanico, D.E., Monterola, C. and Saloma, C. 2007. Growth and robustness of multilevel marketing company. Proceedings of the Samahang Pisika ng Pilipinas, 25(1), SPP-2007-3F-01. URL: https://proceedings.spp-online.org/article/view/SPP-2007-3F-01.