@article{GDZPPN002239027, title = {Trace Formulae for S1 invariant Green's Operators on S2.}, journal = {Manuscripta mathematica}, volume = {94}, year = {1997}, pages = {357-368}, zbl = {0882.58056}, url = {http://dml.mathdoc.fr/item/GDZPPN002239027} }
Engman, Martin. Trace Formulae for S1 invariant Green's Operators on S2.. Manuscripta mathematica, Tome 94 (1997) pp. 357-368. http://gdmltest.u-ga.fr/item/GDZPPN002239027/