@phdthesis{Altıntan2011,
  author        = {Derya Altıntan},
  title         = {An Extension to the Variational Iteration Method for System and Higher-Order Differential Equations},
  school        = {Middle East Technical University},
  year          = {2011},
  address       = {Scientific Computing, Institute of Applied Mathematics, Middle East Technical University}
}

@mastersthesis{Altıntan2006,
  author        = {Derya Altıntan},
  title         = {Extension of the Logistic Equation With Pıecewıse Constant Arguments and Population Dynamics},
  school        = {Middle East Technical University},
  year          = {2006},
  address       = {Scientific Computing, Institute of Applied Mathematics, Middle East Technical University}
}