Rubian, F.K., Lozada, L.S., Florido, E.A., Olap, M.L., Relevo, J., Rosana, C., Sutingco, G.M. and Vergado, E. 2006. Determination of optical spectral signatures of tobacco mosaic virus and frog-eye leaf spot on tobacco leaves. Proceedings of the Samahang Pisika ng Pilipinas, 24(1), SPP-2006-PB-15. URL: https://proceedings.spp-online.org/article/view/SPP-2006-PB-15.