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Trees of british number systems are graceful |
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| Authors: | Thomas Beth Alan P. Sprague |
| Affiliation: | (1) Present address: Institut für Mathematische Maschinen und Datenverarbeitung I, Universität Erlangen-Nürnberg, 8520 Erlangen, West Germany;(2) Present address: Department of Mathematics, Ohio State University, 43210 Columbus, Ohio, USA |
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