1. Optimal preservation and pricing of natural public lands in general equilibrium;Anas;Journal of Environmental Economics and Management,1988
2. Optimal departures from marginal cost pricing;Baumol;American Economic Review,1970
3. A theoretical market model for national parks of different ecological character managed by one agency;Beal;Review of Marketing and Agricultural Studies,1996
4. Propuesta de Variables para Definir Tarifas de Ingreso a las Áreas Silvestres Protegidas para Visitantes no Residentes;Bermúdez,1996
5. Bermúdez, F., 2001. Personal communication. Expert in management of protected areas, SINAC.