@article{10_1017_S0017089502010091,
     author = {Stochel, Jan and Szafraniec, Franciszek Hugon},
     title = {A peculiarity of the creation operator},
     journal = {Glasgow mathematical journal},
     pages = {137--147},
     year = {2002},
     volume = {44},
     number = {1},
     doi = {10.1017/S0017089502010091},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089502010091/}
}