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  1. Forced oscillation of sublinear impulsive differential equations via nonprincipal solution
  2. Sturmian comparison theory for half-linear and nonlinear differential equations via Picone identity
  3. Lyapunov inequalities for mixed nonlinear equations
  4. On the oscillation of Volterra integral equations with positive and negative nonlinearities
  5. Picone type formula for half-linear impulsive differential equations with discontinuous solutions