@article{MS2_1986__59_166988,
     author = {Ernst S. Selmer and Christoph Kirfel},
     title = {Regular h-ranges and weakly pleasant h-bases.},
     journal = {Mathematica Scandinavica},
     pages = {30--40},
     publisher = {mathdoc},
     volume = {59},
     year = {1986},
     zbl = {0614.10045},
     url = {http://geodesic.mathdoc.fr/item/MS2_1986__59_166988/}
}