@booklet {cunha:2008:techreport,
	title = {Bergen Helicopter Nonlinear Model: Complete and Simplified Expressions},
	year = {2008},
	note = {n/a},
	publisher = {Instituto Superior T{\'e}cnico, Institute for Systems and Robotics},
	type = {Internal Report},
	abstract = {n/a},
	author = {Bruno Guerreiro and Cunha, Rita and Silvestre, Carlos}
}
