@article{GDZPPN002084821, title = {Gaps of one dimensional periodic AKNS systems.}, journal = {Forum mathematicum}, volume = {5}, year = {1993}, pages = {459-504}, zbl = {0784.34024}, url = {http://dml.mathdoc.fr/item/GDZPPN002084821} }
Guillot, Jean-Claude; Grébert, Benoit. Gaps of one dimensional periodic AKNS systems.. Forum mathematicum, Tome 5 (1993) pp. 459-504. http://gdmltest.u-ga.fr/item/GDZPPN002084821/