@book{22993,
	author = {Beals, Richard and Greiner, Peter},
	title = {Calculus on Heisenberg manifolds},
	publisher = {Princeton University Press,},
	year = {1988},
	series = {Annals of Mathematics studies },
	address = {Princeton:},
	note = {"Purchased under NBHM grant for the year 2002-2003"}
}