Silva, K.A.I.D.Kotagama, H.B.2014-11-122014-11-121997Tropical Agricultural Research, 9:p.317-329https://dl.nsf.gov.lk/handle/1/12283Natural ResourcesUdawalawe National ParkEconomic valueEnvironmental economicsAn optimal fee for entrance to Udawalawe National Park:an assessmentArticle