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@article{MZ_1990__203_3_174153, author = {Ben de Pagter}, title = {A {Note} on a {Paper} by {W.J.} {Ricker} and {H.H.} {Schaefer.}}, journal = {Mathematische Zeitschrift}, pages = {645--648}, publisher = {mathdoc}, volume = {203}, number = {3}, year = {1990}, zbl = {0669.47026}, url = {http://geodesic.mathdoc.fr/item/MZ_1990__203_3_174153/} }
Ben de Pagter. A Note on a Paper by W.J. Ricker and H.H. Schaefer.. Mathematische Zeitschrift, Tome 203 (1990) no. 3, pp. 645-648. http://geodesic.mathdoc.fr/item/MZ_1990__203_3_174153/