@article {asaad1991groups,
	title = {Groups and fuzzy subgroups},
	journal = {Fuzzy Sets and Systems},
	volume = {39},
	number = {3},
	year = {1991},
	note = {n/a},
	pages = {323{\textendash}328},
	publisher = {North-Holland},
	abstract = {n/a},
	author = {Asaad, Mohamed}
}
