TY - JOUR ID - TI - JO - Journal of Algebraic Hyperstructures and Logical Algebras JA - JAHLA LA - en SN - 2676-6000 Y1 - 1970 PY - 1970 VL - IS - SP - EP - DO - N2 - UR - https://jahla.hatef.ac.ir/article_.html L1 - ER -