TY - JOUR AU - Velagapudi, Uma Maheswara Rao AU - Davuluri, Neelima TI - String cosmological models with bulk viscosity in Nordtvedt's general scalar-tensor theory of gravitation JO - Journal of Theoretical and Applied Physics VL - 0 IS - 1 SP - 0 EP - 0 PY - 2013 DO - 10.1186/2251-7235-7-50 ER -