@article{MS2_1993__73_2_167273,
     author = {Shuang Zhang},
     title = {Homotopy of projections and factorization in the unitary group of certain {C*-algebras.}},
     journal = {Mathematica Scandinavica},
     pages = {281--306},
     publisher = {mathdoc},
     volume = {73},
     number = {2},
     year = {1993},
     zbl = {0808.46085},
     url = {http://geodesic.mathdoc.fr/item/MS2_1993__73_2_167273/}
}