@book{343454,
	author = {Gastal, E. and IICA, Rio de Janeiro, RJ (Brazil)},
	title = {Enfoque de sistemas na programacao da pesquisa agropecuaria},
	year = {1980. },
	address = {Rio de Janeiro, RJ (Brazil): },
	note = {IICA; Several bibliographies; 21 illus.}
}