@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/