@article{1103900390, author = {Woronowicz, S. L.}, title = {Nonextendible positive maps}, journal = {Comm. Math. Phys.}, volume = {46}, number = {1}, year = {1976}, pages = { 243-282}, language = {en}, url = {http://dml.mathdoc.fr/item/1103900390} }
Woronowicz, S. L. Nonextendible positive maps. Comm. Math. Phys., Tome 46 (1976) no. 1, pp. 243-282. http://gdmltest.u-ga.fr/item/1103900390/