@article{10_21136_CMJ_1976_101421,
     author = {Skula, Ladislav},
     title = {On extensions of partial $x$-operators},
     journal = {Czechoslovak Mathematical Journal},
     pages = {477--505},
     publisher = {mathdoc},
     volume = {26},
     number = {3},
     year = {1976},
     doi = {10.21136/CMJ.1976.101421},
     mrnumber = {0414765},
     zbl = {0352.20046},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1976.101421/}
}