@article{Ostrowski:1922,
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	volume = 1,
	journal = "Abh. Math. Sem. Hamburg",
	year = 1922,
	pages = "77-98,250-251",
	note = "Reprinted in {\it Collected Mathematical Papers},
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@article{deBruijn:1949,
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	author = "Bruijn, N. G. de",
	title = "On bases for the set of integers",
	journal = PMD,
	volume = 1,
	year = "1949--50",
	pages = "232-242"}

@article{Katai&Kovacs:1980,
	key = "{K\'atai} and {Kov\'acs} 1980",
	author = "I. {K\'atai} and B. {Kov\'acs}",
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quadratischen algebraischen {Zahlen}",
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	year = 1980,
	pages = "99-107"}

@article{Lanavicensis:1861,
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	author = "Lanavicensis",
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	journal = QJPAM,
	volume = 4,
	year = 1861,
	pages = "94-96; 124-130"}

@article{Lemoine:1882,
	key = "Lemoine 1882",
	author = "M. E. Lemoine",
	title = "{D\'ecomposition} d'um nombre entier $N$ en es puissances
$n^{\hbox{\rm i\`emes}}$ maxima",
	journal = CRASP,
	volume = 95,
	year = 1882,
	pages = "719-723"} 

@article{Grunwald:1885,
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	author = "V. {Gr\"unwald}",
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negativa con particolare riguardo al sistema numerico a base 
negativo-decimale per lo studio delle sue analogie coll`aritmetica (decimale)",
	journal = "Giornale di Matematiche di Battaglini",
	volume = 23,
	year = 1885,
	pages = "203-221",
	note = "Errata, p. 367"}

@article{Lemoine:1896,
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	author = "M. E. Lemoine",
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maxima",
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	volume = 25,
	year = 1896,
	pages = "73-77"}

@article{Lemoine:1900,
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des nombres entiers",
	journal = AFAS,
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	year = 1900,
	pages = "72-74"}

@article{Kempner:1936,
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	author = "A. J. Kempner",
	title = "Anormal systems of numeration",
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	year = 1936, 
	pages = "610-617",
	comment = "checked"}

@article{Shannon:1950,
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        title = "A symmetrical notation for numbers",
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@article{Lekkerkerker:1952,
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	journal = SS,
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@article{deBruijn:1956,
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        author = "Bruijn, N. G. de",
        title = "On number systems",
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        volume = 4,
        year = 1956,
        pages = "15-17"}

@article{Daykin:1960,
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	author = "D. E. Daykin",
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@article{Hoggatt&King:1960,
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	author = "V. E. Hoggatt and C. King",
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	pages = "593",
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	comment = "checked"}

@article{Knuth:1960,
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	note = "Errata, {\bf 4} (1961), 355",
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@article{BrownJ:1961,
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@article{BrownJ:1963,
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@article{Hoggatt&Basin:1963,
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@article{Twaddle:1963,
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        author = "R. D. Twaddle",
        title = "A look at the base negative ten",
        journal = MT,
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        year = 1963,
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@article{Wells:1963,
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        year = 1963,
        pages = "91-93"}

@article{Kautz:1965,
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@article{Penney:1965,
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@article{Klarner:1966,
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@article{NelsonA:1967,
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@inproceedings{Graham:1971,
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@article{Zeckendorf:1972,
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        pages = "213-229"}

@article{Gilbert&Green:1979,
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@article{Matula:1982,
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@incollection{Kamae:1990,
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@incollection{Pihko:1990,
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@unpublished{Gilbert:1991,
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@article{Pihko:1993b,
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