@article{03616721, title = {Convexity, boundedness, and almost periodicity for differential equations in Hilbert space.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {2}, year = {1979}, pages = {1-13}, doi = {10.1155/S0161171279000016}, zbl = {0397.34041}, language = {en}, url = {http://dml.mathdoc.fr/item/03616721} }
Goldstein, Jerome A. Convexity, boundedness, and almost periodicity for differential equations in Hilbert space.. International Journal of Mathematics and Mathematical Sciences, Tome 2 (1979) pp. 1-13. doi : 10.1155/S0161171279000016. http://gdmltest.u-ga.fr/item/03616721/