Abstract
Get full access to this article
View all access options for this article.
References
1.
Van der Pol
B.
, Phil. Mag. 3 , 65 –80 (1927 ).
2.
Cunningham
W. J.
, Introduction to Non-linear Analysis , p. 140 . McGraw-Hill (1958 ).
3.
Suzler
P. G.
, Proc. I.R.E. 36 , 1034 –1039 (1948 ); also 38 , 540 –542 (1950 ).