@article{MS2_1991__68_1_167153,
     author = {Erling Folner},
     title = {Generalization of the general {Diophantine} approximation theorem of {Kronecker.}},
     journal = {Mathematica Scandinavica},
     pages = {148--160},
     publisher = {mathdoc},
     volume = {68},
     number = {1},
     year = {1991},
     zbl = {0731.11040},
     url = {http://geodesic.mathdoc.fr/item/MS2_1991__68_1_167153/}
}