@article{1183555725,
author = {Pizer, Arnold K.},
title = {Ramanujan graphs and Hecke operators},
journal = {Bull. Amer. Math. Soc. (N.S.)},
volume = {23},
number = {1},
year = {1990},
pages = { 127-137},
language = {en},
url = {http://dml.mathdoc.fr/item/1183555725}
}
Pizer, Arnold K. Ramanujan graphs and Hecke operators. Bull. Amer. Math. Soc. (N.S.), Tome 23 (1990) no. 1, pp. 127-137. http://gdmltest.u-ga.fr/item/1183555725/