@article{GDZPPN002077035, title = {An Elementary Set Partition Problem.}, journal = {Elemente der Mathematik}, volume = {24}, year = {1969}, pages = {128-130}, zbl = {0322.05009}, url = {http://dml.mathdoc.fr/item/GDZPPN002077035} }
Abramson, Morton. An Elementary Set Partition Problem.. Elemente der Mathematik, Tome 24 (1969) pp. 128-130. http://gdmltest.u-ga.fr/item/GDZPPN002077035/