Eilenberg, Samuel; Zilber, J. A. (1950). "Semi-Simplicial Complexes and Singular Homology". Annals of Mathematics. 51 (3): 499–513. doi:10.2307/1969364. JSTOR1969364.
Eilenberg, Samuel; Zilber, J. A. (1950). "Semi-Simplicial Complexes and Singular Homology". Annals of Mathematics. 51 (3): 499–513. doi:10.2307/1969364. JSTOR1969364.