@article{ASNSP_2011_5_10_1_99_0,
     author = {Fels, Gregor and kaup, Wilhelm},
     title = {Local tube realizations of {CR-manifolds} and maximal {Abelian} subalgebras},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {99--128},
     publisher = {Scuola Normale Superiore, Pisa},
     volume = {Ser. 5, 10},
     number = {1},
     year = {2011},
     mrnumber = {2829317},
     zbl = {1229.32020},
     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_2011_5_10_1_99_0/}
}