@article{10_4064_sm_65_1_1_5,
     author = {Che-Kao Fong},
     title = {On {M-hyponormal} operators},
     journal = {Studia Mathematica},
     pages = {1--5},
     publisher = {mathdoc},
     volume = {65},
     number = {1},
     year = {1979},
     doi = {10.4064/sm-65-1-1-5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-65-1-1-5/}
}