@article{MAT_1973_17_5_a2,
     author = {R. G. Douglas and R. Howe},
     title = {On the $C^*$-algebra of {Toeplitz} operators on the quarter-plane},
     journal = {Matematika},
     pages = {67--81},
     year = {1973},
     volume = {17},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MAT_1973_17_5_a2/}
}