@article{MASLO_1981__31_3_a3,
     author = {Vonkomerov\'a, Marta},
     title = {On the extension of positive operators},
     journal = {Mathematica slovaca},
     pages = {251--262},
     publisher = {mathdoc},
     volume = {31},
     number = {3},
     year = {1981},
     mrnumber = {621916},
     zbl = {0457.46004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MASLO_1981__31_3_a3/}
}