@article{10_4064_cm140_1_7,
     author = {Andrzej {\L}uczak},
     title = {Range of a contractive strongly positive projection in a $C^*$-algebra},
     journal = {Colloquium Mathematicum},
     pages = {87--89},
     publisher = {mathdoc},
     volume = {140},
     number = {1},
     year = {2015},
     doi = {10.4064/cm140-1-7},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm140-1-7/}
}