@article{GDZPPN002026481, title = {Estimates for En (Xn + 2m).}, journal = {Aequationes mathematicae}, volume = {8}, year = {1972}, pages = {258-262}, zbl = {0256.41017}, url = {http://dml.mathdoc.fr/item/GDZPPN002026481} }
Johnson, L.W.; Riess, R.D. Estimates for En (Xn + 2m).. Aequationes mathematicae, Tome 8 (1972) pp. 258-262. http://gdmltest.u-ga.fr/item/GDZPPN002026481/