@article{1183534442,
author = {Shapiro, Harold S.},
title = {Functions with a spectral gap},
journal = {Bull. Amer. Math. Soc.},
volume = {79},
number = {5},
year = {1973},
pages = { 355-360},
language = {en},
url = {http://dml.mathdoc.fr/item/1183534442}
}
Shapiro, Harold S. Functions with a spectral gap. Bull. Amer. Math. Soc., Tome 79 (1973) no. 5, pp. 355-360. http://gdmltest.u-ga.fr/item/1183534442/