@article{MOMA_1980__89_177972,
     author = {Urban Cegrell},
     title = {Some {Characterizations} of {L-regular} {Points.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {289--292},
     publisher = {mathdoc},
     volume = {89},
     year = {1980},
     zbl = {0429.32023},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1980__89_177972/}
}