Analytical model of strange star in the low-mass X-ray binary 4U 1820-30
  In this article, we have proposed a model for a realistic strange star under Tolman VII metric\citep{Tolman1939}. Here the field equations are reduced to a system of three algebraic equations for anisotropic pressure. Mass, central density and surface density of strange star in the low-mass X-ray binary 4U 1820-30 has been matched with the observational data according to our model. Strange materials clearly satisfies the stability condition (i.e. sound velocities < 1) and TOV-equation. Here also surface red shift of the star has been found to be within reasonable limit. 
Mehedi Kalam, Farook Rahaman, Sajahan Molla, Md. Abdul Kayum Jafry and   Sk. Monowar Hossein
gr-qc