Zero-temperature insulator-metal transition in doped manganites G. Venketeswara Pai, S. R. Hassan, H. R. Krishnamurthy and T. V. Ramakrishnan Europhys. Lett., 64 5 (2003) 696-702 Published online: 01 November 2003 DOI: 10.1209/epl/i2003-00282-0