Witold Lipski Jr., V. Wiktor Marek. Information systems: on queries involving cardinalities. Inf. Syst., 4(1):241-246, 1979.
@article{LipskiM79, title = {Information systems: on queries involving cardinalities}, author = {Witold Lipski Jr. and V. Wiktor Marek}, year = {1979}, researchr = {https://researchr.org/publication/LipskiM79}, cites = {0}, citedby = {0}, journal = {Inf. Syst.}, volume = {4}, number = {1}, pages = {241-246}, }