@article{10_1017_S0017089500003992,
     author = {Lange, Ridgley},
     title = {A purely analytic criterion for a decomposable operator},
     journal = {Glasgow mathematical journal},
     pages = {69--70},
     year = {1980},
     volume = {21},
     number = {1},
     doi = {10.1017/S0017089500003992},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500003992/}
}