TY - JOUR AU - M.W. Grossman TI - A categorical approach to invariant means and fixed point properties. JO - Semigroup forum PY - 1972 SP - 14 EP - 44 VL - 5 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/SF_1972__5_133921/ ID - SF_1972__5_133921 ER -