@article{1077310411,
author = {Ekman, Kenneth E.},
title = {Indices on $C\sp{\ast}$ -algebras through representations in
the Calkin algebra},
journal = {Duke Math. J.},
volume = {41},
number = {1},
year = {1974},
pages = { 413-432},
language = {en},
url = {http://dml.mathdoc.fr/item/1077310411}
}
Ekman, Kenneth E. Indices on $C\sp{\ast}$ -algebras through representations in
the Calkin algebra. Duke Math. J., Tome 41 (1974) no. 1, pp. 413-432. http://gdmltest.u-ga.fr/item/1077310411/