Oscillation Criteria for Forced Second Order Mixed Type Quasilinear Delay Differential Equations
          Thandapani, E.; Murugadass, S.; Pinelas, Sandra  
          
          Electronic Journal of Differential Equations, 73 (2010), 1-9  
          http://ejde.math.txstate.edu/Volumes/2010/73/murugadass.pdf  
           
            
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