Relativistic Electromagnetic Mass Models With Cosmological   Variable$\Lambda$ in Spherically Symmetric Anisotropic Source
  A class of exact solutions for the Einstein-Maxwell field equations are obtained by assuming the erstwhile cosmological constant $ \Lambda $ to be a space-variable scalar, viz., $ \Lambda =\Lambda(r) $. The source considered here is static, spherically symmetric and anisotropic charged fluid. The solutions obtained are matched continuously to the exterior Reissner-Nordstr\"{o}m solution and each of the four solutions represents an electromagnetic mass model. 
R. N. Tiwari, Saibal Ray and Sumana Bhadra
gr-qc