@article{10_4064_cm_46_2_269_273,
     author = {Z. Lipecki and W. Thomsen},
     title = {Extensions of positive operators and extreme points. {IV}},
     journal = {Colloquium Mathematicum},
     pages = {269--273},
     publisher = {mathdoc},
     volume = {46},
     number = {2},
     year = {1982},
     doi = {10.4064/cm-46-2-269-273},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-46-2-269-273/}
}