TY  - JOUR
AU  - Payne, Victor F.
AU  - Tejumola, Haroon Oladipo
TI  - Existence and nonexistence of periodic solutions of $n$-vector differential equations of orders six and seven
JO  - Electronic Journal of Differential Equations
PY  - 2012
VL  - 2012
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/EJDE_2012__2012__a71/
LA  - en
ID  - EJDE_2012__2012__a71
ER  -