@article{10_37236_906,
     author = {Russell May},
     title = {Coupon collecting with quotas},
     journal = {The electronic journal of combinatorics},
     year = {2008},
     volume = {15},
     doi = {10.37236/906},
     zbl = {1182.05005},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/906/}
}