Arsham Borumand Saeid, Some Results on Interval-Valued Fuzzy BG-Algebras. journal = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology. May 2007, vol. 5(5). 259 - 262 [viewed 18 April 2024]. Available from: https://publications.waset.org/pdf/2985.