@article{10_4153_CMB_1982_043_4,
     author = {Johnson, B. E.},
     title = {A {Counterexample} in the {Perturbation} {Theory} of {C*-Algebras}},
     journal = {Canadian mathematical bulletin},
     pages = {311--316},
     year = {1982},
     volume = {25},
     number = {3},
     doi = {10.4153/CMB-1982-043-4},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1982-043-4/}
}