Spectroscopy of the a3Σu+ state and the coupling to the X1Σg+ state of K2A. Pashov, P. Popov, H. Knöckel and E. TiemannEur. Phys. J. D, 46 2 (2008) 241-249DOI: https://doi.org/10.1140/epjd/e2007-00307-2