@article{Russo1988,
	title = {On the last exit time and the number of exits of partial sums over
	a moving boundary},
	author = {Ralph P. Russo},
	journal = {Statistics \& Probability Letters},
	month = {May},
	number = {6},
	pages = {371--377},
	url = {http://www.sciencedirect.com/science/article/B6V1D-47N61KW-27/1/4063ddc96a7fe0ae1ce8da007aa21104},
	volume = {6},
	year = {1988},
	biburl = {http://www.bibsonomy.org/bibtex/24b68ef1397f7f181dab9c2ff45f3627b/smicha},
	keywords = {of random sums variables }
}