Investigation of storage of ultra-cold neutrons in traps V. V. Nesvizhevsky, A. V. Strelkov, P. Geltenbort and P. S. Iaydjiev Eur. Phys. J. AP, 6 2 (1999) 151-154 Published online: 15 May 1999 DOI: 10.1051/epjap:1999165