@article{MOMA_1967__71_177364,
     author = {Jack Ohm},
     title = {Integral {Closure} and (x, y)n = (xn, yn).},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {32--39},
     publisher = {mathdoc},
     volume = {71},
     year = {1967},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1967__71_177364/}
}