@inbook {2001,
	title = {S^2 type parametric surfaces with prescribed mean curvature and minimal energy},
	booktitle = {Nonlinear equations : methods, models and applications (Bergamo, 2001) / Daniela Lupo, Carlo D. Pagani, Bernhard Ruf, editors. - Basel : Birkh{\"a}user, 2003. - (Progress in nonlinear differential equations and their applications; 54). - p. 61-77},
	number = {SISSA;34/2002/M},
	year = {2001},
	publisher = {Birkhauser},
	organization = {Birkhauser},
	url = {http://hdl.handle.net/1963/1605},
	author = {Paolo Caldiroli and Roberta Musina}
}
