@article {BPCZAT11, 
	title = {Requirements for the Graceful Shutdown  of BGP Sessions},
	journal = {Internet Engineering Task Force (IETF) Request for Comments (RFC)},
	number = {6198},
	author = {B. Decraene and Pierre Francois and Cristel  Pelsser and Z. Ahmad and A.J. Elizondo Armengol and T. Takeda},
	year = {2011},
	month = {April},
}