@article{CM_1974__29_1_35_0,
     author = {Maddox, I. J.},
     title = {Kuttner's theorem for operators},
     journal = {Compositio Mathematica},
     pages = {35--41},
     publisher = {Noordhoff International Publishing},
     volume = {29},
     number = {1},
     year = {1974},
     mrnumber = {361524},
     zbl = {0296.46016},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1974__29_1_35_0/}
}