González-Díaz, Rocío; Real, Pedro A curious combination of topology, algebra and combinatorics: the Steenrod squares. (Spanish) Zbl 1358.55011 Gac. R. Soc. Mat. Esp. 1, No. 3, 458-466 (1998). MSC: 55S05 Primary cohomology operations in algebraic topology 05A99 Enumerative combinatorics PDFBibTeX XMLCite \textit{R. González-Díaz} and \textit{P. Real}, Gac. R. Soc. Mat. Esp. 1, No. 3, 458--466 (1998; Zbl 1358.55011)