Nieto, José Heber Permutations and the 15-puzzle. (Spanish) Zbl 1117.05300 Bol. Asoc. Mat. Venez. 12, No. 2, 259-264 (2005). MSC: 05A05 × Cite Format Result Cite Review PDF Full Text: EuDML
Nieto, José Heber; Peña P., Alirio J. A retrospective on the studies of mathematics at the University of Zulia. (Spanish) Zbl 1172.01336 Bol. Asoc. Mat. Venez. 7, No. 1-2, 101-110 (2000). MSC: 01A73 × Cite Format Result Cite Review PDF Full Text: EuDML