@article{GDZPPN002210975,
title = {Local isometric immersions of R2 into R4.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {435},
year = {1993},
pages = {205-219},
zbl = {0782.53018},
url = {http://dml.mathdoc.fr/item/GDZPPN002210975}
}
Dajczer, M.; Do Carmo, M. Local isometric immersions of R2 into R4.. Journal für die reine und angewandte Mathematik, Tome 435 (1993) pp. 205-219. http://gdmltest.u-ga.fr/item/GDZPPN002210975/