@article{1255631587, author = {Gilbert, E. N. and Riordan, John}, title = {Symmetry types of periodic sequences}, journal = {Illinois J. Math.}, volume = {5}, number = {1}, year = {1961}, pages = { 657-665}, language = {en}, url = {http://dml.mathdoc.fr/item/1255631587} }
Gilbert, E. N.; Riordan, John. Symmetry types of periodic sequences. Illinois J. Math., Tome 5 (1961) no. 1, pp. 657-665. http://gdmltest.u-ga.fr/item/1255631587/