@article{1028998672,
author = {Gehring, F. W.},
title = {Extremal length definitions for the conformal capacity of rings in space.},
journal = {Michigan Math. J.},
volume = {9},
number = {1},
year = {1962},
pages = { 137-150},
language = {en},
url = {http://dml.mathdoc.fr/item/1028998672}
}
Gehring, F. W. Extremal length definitions for the conformal capacity of rings in space.. Michigan Math. J., Tome 9 (1962) no. 1, pp. 137-150. http://gdmltest.u-ga.fr/item/1028998672/