Limits on a nucleon–nucleon monopole–dipole coupling from spin relaxation of polarized ultra-cold neutrons in trapsV. K. Ignatovich and Y. N. PokotilovskiEur. Phys. J. C, 64 1 (2009) 19-23DOI: https://doi.org/10.1140/epjc/s10052-009-1150-8