@article{GDZPPN002203626,
title = {Surfaces of order 1 in Grassmannians.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {372},
year = {1986},
pages = {119-126},
zbl = {0601.14042},
url = {http://dml.mathdoc.fr/item/GDZPPN002203626}
}
Ran, Ziv. Surfaces of order 1 in Grassmannians.. Journal für die reine und angewandte Mathematik, Tome 372 (1986) pp. 119-126. http://gdmltest.u-ga.fr/item/GDZPPN002203626/