@article{DCG_1990__5_2_131107,
     author = {W. Kern and A. Wanka},
     title = {On a {Problem} {About} {Covering} {Lines} by {Squares.}},
     journal = {Discrete & computational geometry},
     pages = {77--82},
     publisher = {mathdoc},
     volume = {5},
     number = {2},
     year = {1990},
     zbl = {0691.52011},
     url = {http://geodesic.mathdoc.fr/item/DCG_1990__5_2_131107/}
}