@article{
  author = {Velagapudi, Uma Maheswara Rao, Davuluri, Neelima},
  title = {String cosmological models with bulk viscosity in Nordtvedt's general scalar-tensor theory of gravitation},
  journal = {Journal of Theoretical and Applied Physics},
  year = {2013},
  volume = {0},
  number = {1},
  pages = {0-0},
  doi = {10.1186/2251-7235-7-50}
}