@article{10_4153_CJM_1977_108_x,
     author = {Choi, Man-Duen and Effros, Edward G.},
     title = {Lifting {Problems} and the {Cohomology} of {C*-Algebras}},
     journal = {Canadian journal of mathematics},
     pages = {1092--1111},
     year = {1977},
     volume = {29},
     number = {5},
     doi = {10.4153/CJM-1977-108-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1977-108-x/}
}