Oscillation Criteria For Even-Order Nonlinear Neutral Differential Equations of Mixed Type
          Thandapani, E.; Padmavathi, S.; Pinelas, Sandra  
          
          Bulletin of Mathematical Analysis and Applications, 6(1) (2014), 9-22  
          http://www.emis.de/journals/BMAA/repository/docs/BMAA6_1_2.pdf  
           
            
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