@article{1103038066,
author = {Harmon, Sidney M.},
title = {Regular covering surfaces of Riemann surfaces.},
journal = {Pacific J. Math.},
volume = {10},
number = {4},
year = {1960},
pages = { 1263-1289},
language = {en},
url = {http://dml.mathdoc.fr/item/1103038066}
}
Harmon, Sidney M. Regular covering surfaces of Riemann surfaces.. Pacific J. Math., Tome 10 (1960) no. 4, pp. 1263-1289. http://gdmltest.u-ga.fr/item/1103038066/