@article{1178242818,
author = {Igari, Satoru},
title = {Saturation of the approximation by eigenfunction expansions associated with the Laplace operator},
journal = {Tohoku Math. J. (2)},
volume = {22},
number = {4},
year = {1970},
pages = { 231-239},
language = {en},
url = {http://dml.mathdoc.fr/item/1178242818}
}
Igari, Satoru. Saturation of the approximation by eigenfunction expansions associated with the Laplace operator. Tohoku Math. J. (2), Tome 22 (1970) no. 4, pp. 231-239. http://gdmltest.u-ga.fr/item/1178242818/