@article{ShojaeiFard2013,
  author    = {Shojaei-Fard, Ali},
  title     = {A GEOMETRIC PERSPECTIVE ON COUNTERTERMS RELATED TO DYSON-SCHWINGER EQUATIONS},
  series = {INTERNATIONAL JOURNAL OF MODERN PHYSICS A},
  volume    = {28},
  journal   = {INTERNATIONAL JOURNAL OF MODERN PHYSICS A},
  number    = {32},
  publisher = {WORLD SCIENTIFIC PUBL CO PTE LTD},
  address   = {SINGAPORE},
  issn      = {0217-751X},
  doi       = {10.1142/S0217751X13501704},
  pages     = {15},
  year      = {2013},
  abstract  = {We study Dyson-Schwinger equations (DSEs) in terms of some groups of diffeographisms to provide a new geometric formulation for their corresponding counterterms on the basis of systems of ordinary differential equations.},
  language  = {en}
}
@article{ShojaeiFard2014,
  author    = {Shojaei-Fard, Ali},
  title     = {Counterterms in the context of the universal Hopf algebra of renormalization},
  series = {International journal of modern physics : A, Particles and fields, gravitation, cosmology, nuclear physics},
  volume    = {29},
  journal   = {International journal of modern physics : A, Particles and fields, gravitation, cosmology, nuclear physics},
  number    = {8},
  publisher = {World Scientific},
  address   = {Singapore},
  issn      = {0217-751X},
  doi       = {10.1142/S0217751X14500456},
  pages     = {15},
  year      = {2014},
  abstract  = {The manuscript discovers a new interpretation of counterterms of renormalizable Quantum Field Theories in terms of formal expansions of decorated rooted trees.},
  language  = {en}
}