Vol. 68,   1   (1999) pp.   137-151
A PICONE TYPE IDENTITY FOR SECOND ORDER HALF-LINEAR DIFFERENTIAL EQUATIONS
J. JAROS and T. KUSANO
Abstract. 
In the paper a Picone-type identity for half-linear differential equations of second order is derived and Sturmian theory for both forced and unforced half-linear and quasilinear equations based on this identity is developed.