@article{MS2_1979__45_166668,
     author = {Erling Stormer and Edward G. Effros},
     title = {Positive projections and {Jordan} structure in operator algebras.},
     journal = {Mathematica Scandinavica},
     pages = {127--138},
     publisher = {mathdoc},
     volume = {45},
     year = {1979},
     zbl = {0455.46059},
     url = {http://geodesic.mathdoc.fr/item/MS2_1979__45_166668/}
}