Drechsler, S. L., Málek, J., Záliš, S., Rósciszewski, K. Superexchange, charge gap, and lattice distortions of Sr(Ca)2CuO3 - the interplay of e-e and e-ph interactions. Journal of Superconductivity. 1996, 9(4), 439-441. ISSN 0896-1107.