@article{article45ffa05b,
title   = {Smooth operators for the action of SO(3) on L2(S2)},
author = {Cordes, H. O. and Melo, Severino Toscano do Rego},
year = {1997},
doi = {10.1007/bf01294153},
journal   = {Integral Equations and Operator Theory}
}