@article{SF_1972__5_133921,
     author = {M.W. Grossman},
     title = {A categorical approach to invariant means and fixed point properties.},
     journal = {Semigroup forum},
     pages = {14--44},
     publisher = {mathdoc},
     volume = {5},
     year = {1972},
     zbl = {0259.43011},
     url = {http://geodesic.mathdoc.fr/item/SF_1972__5_133921/}
}