@article{MZ_1987__194_173829,
     author = {Yaakov Friedamnn and Bernhard Russo},
     title = {Conditional {Expectation} and {Bicontractive} {Projections} on {Jordan} {C*-algebras} and {Their} {Generalizations.}},
     journal = {Mathematische Zeitschrift},
     pages = {227--236},
     publisher = {mathdoc},
     volume = {194},
     year = {1987},
     zbl = {0598.46044},
     url = {http://geodesic.mathdoc.fr/item/MZ_1987__194_173829/}
}