@article{10_1017_S0017089500009277,
     author = {Stochel, Jerzy Bart{\l}omiej},
     title = {Subnormality and generalized commutation relations of families of operators{\textdagger}},
     journal = {Glasgow mathematical journal},
     pages = {231--238},
     year = {1990},
     volume = {32},
     number = {2},
     doi = {10.1017/S0017089500009277},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500009277/}
}