Comparison and oscillation theorems for second order differential equations Vincent Šoltés (1996) Mathematica Slovaca Similarity:
Oscillation of second order differential equations with advanced argument Jozef Džurina (1995) Mathematica Slovaca Similarity:
Oscillation criteria for differential equation y ( 4 ) + P ( t ) y ' ' + R ( t ) y ' + Q ( t ) y = 0 Ján Regenda (1984) Mathematica Slovaca Similarity: