@book {66232,
	title = {Multicarrier wave dual reference very low frequency PWM control of a nine levels NPC multi-string three phase inverter topology for photovoltaic system connected to a medium electric grid},
	year = {2014},
	month = {2014},
	author = {Rabiaa Mechouma and Aboub, Hania and Boubekeur Azoui}
}
