title: When is a linear combination of independent fBm’s equivalent to a single fBm?
author:Harry van Zante
source:Stochastic Processes and their Applications
Volume 117, Issue 1, January 2007,Pages 57-70

link:http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V1B-4K7X87T-4&_user=1555633&_coverDate=01%2F31%2F2007&_rdoc=1&_fmt=high&_orig=search&_sort=d&_docanchor=&view=c&_rerunOrigin=scholar.google&_acct=C000053088&_version=1&_urlVersion=0&_userid=1555633&md5=b478275b2e82550f4a172b24e3d8e794