Sepúlveda Gallego, L. E., and G. . Agudelo Montoya. “Some Principles of Ecological Ethics in Public Health”. Revista Luna Azul (On Line), no. 9-10, July 2000, p. 1 de 3, https://revistasojs.ucaldas.edu.co/index.php/lunazul/article/view/1450.