Simple determination of Na2 scattering lengths using observed bound levels at the ground state asymptote A. Crubellier, O. Dulieu, F. Masnou-Seeuws, M. Elbs, H. Knöckel and E. Tiemann Eur. Phys. J. D, 6 2 (1999) 211-220 Published online: 15 May 1999 DOI: 10.1007/s100530050303