L. H. Harper. On a problem of Kleitman and West. Discrete Mathematics, 93(2-3):169-182, 1991. [doi]
@article{Harper91:0, title = {On a problem of Kleitman and West}, author = {L. H. Harper}, year = {1991}, doi = {10.1016/0012-365X(91)90253-X}, url = {http://dx.doi.org/10.1016/0012-365X(91)90253-X}, researchr = {https://researchr.org/publication/Harper91%3A0}, cites = {0}, citedby = {0}, journal = {Discrete Mathematics}, volume = {93}, number = {2-3}, pages = {169-182}, }