共 50 条
- [25] A GEOMETRICAL APPROACH TO SECOND-ORDER LINEAR DIFFERENTIAL EQUATION [J]. CANADIAN JOURNAL OF MATHEMATICS, 1962, 14 (02): : 349 - &
- [27] On the Oscillation of a Second Order Strictly Sub linear Differential Equation [J]. CANADIAN MATHEMATICAL BULLETIN-BULLETIN CANADIEN DE MATHEMATIQUES, 2010, 53 (02): : 193 - 203