@article{10_4153_CJM_1968_020_1,
     author = {Rajagopalan, M. and Witz, K. G.},
     title = {On {Invariant} {Means} which are {Not} {Inverse} {Invariant}},
     journal = {Canadian journal of mathematics},
     pages = {222--224},
     year = {1968},
     volume = {20},
     number = {1},
     doi = {10.4153/CJM-1968-020-1},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1968-020-1/}
}