@article{10_1017_S0017089500007680,
     author = {Duggal, B. P.},
     title = {A remark on the essential spectra of quasi-similar dominant contractions},
     journal = {Glasgow mathematical journal},
     pages = {165--168},
     year = {1989},
     volume = {31},
     number = {2},
     doi = {10.1017/S0017089500007680},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500007680/}
}