Gravito-optical atom trap based on a conical hollow beam Yu. B. Ovchinnikov, I. Manek, A. I. Sidorov, G. Wasik and R. Grimm Europhys. Lett., 43 5 (1998) 510-515 Published online: 01 September 2002 DOI: 10.1209/epl/i1998-00390-9