TY  - JOUR
AU  - J. W. Heidel
TI  - Addenda to "Periodic solutions of $x" + f(x)x'^{2n} + g(x) = 0$ with arbitrarily large period''
JO  - Annales Polonici Mathematici
PY  - 1972
SP  - 163
EP  - 165
VL  - 27
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/ap-27-2-163-165/
DO  - 10.4064/ap-27-2-163-165
LA  - en
ID  - 10_4064_ap_27_2_163_165
ER  -