Evaluation of Cogon (imperata cyluidrica (L.) Beauv.) as a seral stage in Philippine vegetational succession I. The cogonal seral stage and plant succession. II. Autecological studies on Cogon - Sajise, Percy Eres, 1943- (Ann Arbor, Mich. : University Microfilms International, 1972)
Thesis (Ph.D.) - Cornell University, 1972