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1973, pp.~93--148"}

@article{Grabner&Liardet:1999,
	key = "Grabner and Liardet 1999",
	author = "P. J. Grabner and P. Liardet",
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	journal = AA,
	volume = 91,
	year = 1999,
	pages = "329-349"}

@article{Grabner&Kirschenhofer&Prodinger:1998,
	key = "Grabner, Kirschenhofer, and Prodinger 1998",
	author = "P. J. Grabner and P. Kirschenhofer and H. Prodinger",
	title = "The sum-of-digits function for complex bases",
	journal = JLMS,
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	pages = "20-40"}