Gideon Ehrlich. Generator of Set-Partitions to Exactly R Subsets [G7] (Algorithm 477). Communications of the ACM, 17(4):224-225, 1974.
@article{Ehrich74:0, title = {Generator of Set-Partitions to Exactly R Subsets [G7] (Algorithm 477)}, author = {Gideon Ehrlich}, year = {1974}, tags = {partitioning}, researchr = {https://researchr.org/publication/Ehrich74%3A0}, cites = {0}, citedby = {0}, journal = {Communications of the ACM}, volume = {17}, number = {4}, pages = {224-225}, }