TY  - JOUR
AU  - H. Guggenheimer
TI  - Hill Equations with Coexisting Periodic Solutions, II.
JO  - Commentarii mathematici Helvetici
PY  - 1969
SP  - 381
EP  - 384
VL  - 44
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/CMH_1969__44_139408/
ID  - CMH_1969__44_139408
ER  -