Determination of the transmission spectra of a celery (Apium graveolens dulce) leaf infected with Septoria (Septoria apiicola) late blight - Albia, Jason R.; Bugna, Joybel G.; Cabe, Fatima P.; Divinagracia, Ma. Concepcion; Gamboa, Melody Joy; Florido, Emmanuel A.; Amada, Maricon R. (Proceedings of the Samahang Pisika ng Pilipinas, 2006)