@article{10_4064_cm_44_2_309_315,
     author = {Ryszard Grz\k{a}\'slewicz},
     title = {Extreme operators on 2-dimensional $l_p$-spaces},
     journal = {Colloquium Mathematicum},
     pages = {309--315},
     publisher = {mathdoc},
     volume = {44},
     number = {2},
     year = {1981},
     doi = {10.4064/cm-44-2-309-315},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-44-2-309-315/}
}