Accretion of new variable modified Chaplygin gas and generalized cosmic Chaplygin gas onto Schwarzschild and Kerr–Newman black holesJhumpa Bhadra and Ujjal DebnathEur. Phys. J. C, 72 3 (2012) 1912DOI: https://doi.org/10.1140/epjc/s10052-012-1912-6