@article{AIHPA_1989__50_2_161_0,
     author = {Antoine, J.-P. and Karwowski, W.},
     title = {Commuting normal operators in partial $L^2 (\mathbb {R}^2)$-algebras},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {161--185},
     publisher = {Gauthier-Villars},
     volume = {50},
     number = {2},
     year = {1989},
     mrnumber = {1002818},
     zbl = {0678.47041},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1989__50_2_161_0/}
}