@article{10_4153_CJM_1987_043_x,
     author = {Bercovici, Hari},
     title = {Three {Test} {Problems} for {Quasisimilarity}},
     journal = {Canadian journal of mathematics},
     pages = {880--892},
     year = {1987},
     volume = {39},
     number = {4},
     doi = {10.4153/CJM-1987-043-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1987-043-x/}
}