@article{1181073066,
author = {Schaaf, Renate and Schmitt, Klaus},
title = {Period perturbations of linear problems at resonance on convex domains},
journal = {Rocky Mountain J. Math.},
volume = {20},
number = {4},
year = {1990},
pages = { 1119-1131},
language = {en},
url = {http://dml.mathdoc.fr/item/1181073066}
}
Schaaf, Renate; Schmitt, Klaus. Period perturbations of linear problems at resonance on convex domains. Rocky Mountain J. Math., Tome 20 (1990) no. 4, pp. 1119-1131. http://gdmltest.u-ga.fr/item/1181073066/