@article{1250125975,
author = {Schempp, Walter},
title = {Extensions of the Heisenberg group and coaxial coupling of transverse eigenmodes},
journal = {Rocky Mountain J. Math.},
volume = {19},
number = {4},
year = {1989},
pages = { 383-394},
language = {en},
url = {http://dml.mathdoc.fr/item/1250125975}
}
Schempp, Walter. Extensions of the Heisenberg group and coaxial coupling of transverse eigenmodes. Rocky Mountain J. Math., Tome 19 (1989) no. 4, pp. 383-394. http://gdmltest.u-ga.fr/item/1250125975/