@article{CMUC_1979_20_1_a2,
     author = {Viet, Ho Duc and Thiep, Nguyen},
     title = {A note on close-to-normal structure},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {29--36},
     year = {1979},
     volume = {20},
     number = {1},
     mrnumber = {526145},
     zbl = {0407.47038},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1979_20_1_a2/}
}