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@article{AUCMP_1971__12_2_a1, author = {Kussov\'a, B.}, title = {Trajectories and natural numbers}, journal = {Acta Universitatis Carolinae. Mathematica et Physica}, pages = {3--20}, publisher = {mathdoc}, volume = {12}, number = {2}, year = {1971}, mrnumber = {0335263}, zbl = {0268.02052}, language = {en}, url = {http://geodesic.mathdoc.fr/item/AUCMP_1971__12_2_a1/} }
Kussová, B. Trajectories and natural numbers. Acta Universitatis Carolinae. Mathematica et Physica, Tome 12 (1971) no. 2, pp. 3-20. http://geodesic.mathdoc.fr/item/AUCMP_1971__12_2_a1/