Mustafa Demirci Fundamentals of M-Vague Algebra and M-Vague Arithmetic Operations. 25-75 2002 10 International Journal of Uncertainty, Fuzziness and Knowledge-Based Systems 1 http://www.worldscinet.com/ijufks/10/1001/S0218488502001326.html db/journals/ijufks/ijufks10.html#Demirci02