@inbook{hajek2011,
	title     = {Introduction to mathematical Fuzzy Logic},
	author    = {Libor Behounek and  Petr Cintula and  Petr Hajek},
	year      = {2011},
	editor    = {Petr Cintula, Petr Hajek, Carles Noguera },
	publisher = {College Publications},
	booktitle = {Handbook of Mathematical Fuzzy Logic},
	state     = {inpress},
	acknowledged= {1}
}