Aranas, R.K.D., 		Abuel, M.C., 		del Rosario, E., 		Locsin, J.D.C., AND 		Villanueva, M.J..
" A COLLABORATIVE SPATIAL DATABASE FOR THE INVENTORY OF TREES IN THE UNIVERSITY OF THE PHILIPPINES DILIMAN CAMPUS" <em>Philippine Engineering Journal</em> [Online], Volume 33 Number 2 (14 August 2013)