@phdthesis{Sertkaya2014,
  author        = {İsa Sertkaya},
  title         = {On Nonlinearity and Hamming Weight Preserving Bijective  Mappings Acting on Boolean Functions, PhD in Cryptography},
  school        = {Middle East Technical University},
  year          = {2014},
  address       = {Cryptography, Institute of Applied Mathematics, Middle East Technical University}
}

@mastersthesis{Sertkaya2004,
  author        = {İsa Sertkaya},
  title         = {Nonlinearity Preserving Post-transformations},
  school        = {Middle East Technical University},
  year          = {2004},
  address       = {Cryptography, Institute of Applied Mathematics, Middle East Technical University, Ankara, Turkey}
}