@article{GDZPPN002207540,
title = {Strips with parallel second fundamental form in pseudo-Riemannian manifolds.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {405},
year = {1990},
pages = {19-32},
zbl = {0692.53006},
url = {http://dml.mathdoc.fr/item/GDZPPN002207540}
}
Reckziegel, H.; Meumertzheim, Th. Strips with parallel second fundamental form in pseudo-Riemannian manifolds.. Journal für die reine und angewandte Mathematik, Tome 405 (1990) pp. 19-32. http://gdmltest.u-ga.fr/item/GDZPPN002207540/