TY  - JOUR
AU  - Hakl, Robert
AU  - Zamora, Manuel
TI  - Periodic Solutions of an Indefinite Singular Equation Arising from the Kepler Problemon the Sphere
JO  - Canadian journal of mathematics
PY  - 2018
SP  - 173
EP  - 190
VL  - 70
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-2016-050-1/
DO  - 10.4153/CJM-2016-050-1
ID  - 10_4153_CJM_2016_050_1
ER  -