@inproceedings{Buchmann&Pohst:1988,
	key = "Buchmann and Pohst 1988",
	author = "J. Buchmann and M. Pohst",
	title = "On the complexity of computing class groups of algebraic
number fields",
	booktitle = "AAECC-6",
	editor = "T. Mora",
	series = LNICS,
	volume = 357,
	year = 1988,
	pages = "123-130"}

@article{Buchmann&Williams:1989,
	key = "Buchmann and Williams 1989",
	author = "J. Buchmann and H. C. Williams",
	title = "On the computation of the class number of an algebraic
number field",
	journal = MC,
	year = 1989,
	volume = 53,
	pages = "679-688"}

@article{Pohst&Zassenhaus:1985,
	key = "Pohst and Zassenhaus 1985",
	author = "M. Pohst and H. Zassenhaus",
	title = "{\"Uber} die {Berechnung} von {Klassenzahlen} und
{Klassengruppen} algebraischer {Zahlk\"orper}",
	journal = JFRAM,
	volume = 361,
	year = 1985,
	pages = "50-72"}

@article{Buell:1976,
	key = "Buell 1976",
	author = "D. A. Buell",
	title = "Class groups of quadratic fields",
	journal = MC,
	volume = 30,
	year = 1976,
	pages = "610-623"}

@book{Mathews:1892,
	key = "Mathews 1892",
	author = "G. B. Mathews",
	title = "Theory of Numbers",
	publisher = "G. Bell and Sons",
	address = "London",
	year = 1962,
	note = "Reprinted by Chelsea, New York, 1962"}

@article{Hafner&McCurley:1989a,
	key = "Hafner and McCurley 1989a",
	author = "J. L. Hafner and K. S. McCurley",
	title = "A rigorous subexponential algorithm for computation
of class groups",
	journal = JAMS,
	volume = 2,
	year = "{\noopsort{1989a}}1989",
	pages = "837-850"}

@article{Mollin&Williams:1992,
	key = "Mollin and Williams 1992",
	author = "R. A. Mollin and H. C. Williams",
	title = "Computation of the class number of a real quadratic
field",
	journal = UM,
	volume = 41,
	year = 1992,
	pages = "259-308"}

@incollection{Ribenboim:1991,
	key = "Ribenboim 1991",
	author = "P. Ribenboim",
	title = "Gauss and the class number problem",
	booktitle = "Proc. International Symp. on Mathematics and Theoretical Physics (Guaruj\'a, 1989)",
	pages = "3-63",
	note = "{\it Sympos. Gaussiana Ser. A Math. Theoret. Phys.} {\bf 1},
                Inst. Gaussianum, Toronto, Ontario"}

@article{Buchmann&Williams:1991,
	key = "Buchmann and Williams 1991",
	author = "J. A. Buchmann and H. C. Williams",
	title = "Some remarks concerning the complexity of computing class groups of
quadratic fields",
	journal = JCOMP,
	volume = 7,
	year = 1991,
	pages = "311-315"}

@incollection{Thiel:1994,
	key = "Thiel 1994",
	author = "C. Thiel",
	title = "Under the assumption of the {Generalized Riemann Hypothesis}
verifying the class number belongs to {$\NPee \cap {\rm co-}\NPee$}",
	booktitle = ANTS1,
	editor = "L. M. Adleman and M.-D. Huang",
	series = LNICS,
	volume = 877,
	publisher = SV,
	year = 1994,
	pages = "234-247"}

