@article {botros2009lifetime,
	title = {Lifetime optimization in hierarchical wireless sensor networks},
	journal = {Emerging Technologies \& Factory Automation, 2009. ETFA 2009. IEEE Conference on},
	year = {2009},
	note = {n/a},
	pages = {1{\textendash}8},
	publisher = {IEEE},
	abstract = {n/a},
	author = {Botros, Samy S and Elsayed, Hany M and Amer, Hassanein H and M. S. El-Soudani}
}
