@book{7113,
	author = {Perttu, K. L. and Kowalik, P. J.},
	title = {Modelling of energy forestry growth, water relations and economics},
	publisher = {Pudoc,},
	year = {1989},
	series = {Simulation monographs},
	address = {Wageningen :},
	note = {64-80}
}