Towards a test of string theory using Rydberg atoms J.-P. Connerade, S. D. Hogan, H.-P. Liu and M.-S. Zhan Eur. Phys. J. D, 46 3 (2008) 431-435 Published online: 21 December 2007 DOI: 10.1140/epjd/e2007-00335-x