@article{10_21136_MB_1998_125966,
     author = {Kr\'al, Josef and Medkov\'a, Dagmar},
     title = {Essential norms of a potential theoretic boundary integral operator in $L\sp 1$},
     journal = {Mathematica Bohemica},
     pages = {419--436},
     publisher = {mathdoc},
     volume = {123},
     number = {4},
     year = {1998},
     doi = {10.21136/MB.1998.125966},
     mrnumber = {1667114},
     zbl = {0936.31007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/MB.1998.125966/}
}