@article{MS2_1971__29_166192,
     author = {Michael Singer},
     title = {A {Product} {Theorem} for {Lattices} over {Orders.}},
     journal = {Mathematica Scandinavica},
     pages = {50--54},
     publisher = {mathdoc},
     volume = {29},
     year = {1971},
     zbl = {0229.13010},
     url = {http://geodesic.mathdoc.fr/item/MS2_1971__29_166192/}
}