@article{10_1017_S0017089500005966,
     author = {Lange, Ridgley},
     title = {Biquasitriangularity and spectral continuity},
     journal = {Glasgow mathematical journal},
     pages = {177--180},
     year = {1985},
     volume = {26},
     number = {2},
     doi = {10.1017/S0017089500005966},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500005966/}
}