@article{GDZPPN002210290,
title = {Second order differentiability of integral functionals on Sobolev spaces and L2-spaces.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {435},
year = {1993},
pages = {1-18},
zbl = {0767.49010},
url = {http://dml.mathdoc.fr/item/GDZPPN002210290}
}
Noll, Dominikus. Second order differentiability of integral functionals on Sobolev spaces and L2-spaces.. Journal für die reine und angewandte Mathematik, Tome 435 (1993) pp. 1-18. http://gdmltest.u-ga.fr/item/GDZPPN002210290/