@article{10_1017_S0017089500008594,
     author = {Lange, Ridgley and Wang, Shengwang},
     title = {Universal notions characterizing spectral decompositions},
     journal = {Glasgow mathematical journal},
     pages = {109--116},
     year = {1992},
     volume = {34},
     number = {1},
     doi = {10.1017/S0017089500008594},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500008594/}
}