@article{1103044956, author = {Petersen, G. M.}, title = {Methods of summation.}, journal = {Pacific J. Math.}, volume = {4}, number = {4}, year = {1954}, pages = { 73-77}, language = {en}, url = {http://dml.mathdoc.fr/item/1103044956} }
Petersen, G. M. Methods of summation.. Pacific J. Math., Tome 4 (1954) no. 4, pp. 73-77. http://gdmltest.u-ga.fr/item/1103044956/