For the coupon collector's problem, invariance principles for the partial sequence of bonus sums after $n$ coupons as well as the waiting times to obtain the bonus sum $t(\geqslant 0)$ are studied through a construction of a triangular array of martingales related to these sequences and verifying the invariance principles for these martingales.
@article{1176344620,
author = {Sen, Pranab Kumar},
title = {Invariance Principles for the Coupon Collector's Problem: A Martingale Approach},
journal = {Ann. Statist.},
volume = {7},
number = {1},
year = {1979},
pages = { 372-380},
language = {en},
url = {http://dml.mathdoc.fr/item/1176344620}
}
Sen, Pranab Kumar. Invariance Principles for the Coupon Collector's Problem: A Martingale Approach. Ann. Statist., Tome 7 (1979) no. 1, pp. 372-380. http://gdmltest.u-ga.fr/item/1176344620/