@article{GDZPPN00229754X,
title = {Absolute Convergence of Eigenfunction Expansions.},
journal = {Mathematische Annalen},
volume = {174},
year = {1967},
pages = {307-314},
zbl = {0145.39701},
url = {http://dml.mathdoc.fr/item/GDZPPN00229754X}
}
PEETRE, J. Absolute Convergence of Eigenfunction Expansions.. Mathematische Annalen, Tome 174 (1967) pp. 307-314. http://gdmltest.u-ga.fr/item/GDZPPN00229754X/