@article{10_37236_3348,
     author = {Nathan B. Shank and Hannah Yang},
     title = {Coupon collector problem for non-uniform coupons and random quotas},
     journal = {The electronic journal of combinatorics},
     year = {2013},
     volume = {20},
     number = {2},
     doi = {10.37236/3348},
     zbl = {1267.05288},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/3348/}
}