1. Shapiro F.L., in Proceedings of the International Conference on Nuclear Structure with Neutrons, Budapest, 1972 edited by Ero J., Szucs J. (Plenum, New York, 1972), p. 259
2. Steyerl A., in Neutron Physics, Springer Tracts in Modern Physics, vol. 80 (Springer, Berlin, Heidelberg, New York, 1977), p. 57
3. Ultra-cold neutrons
4. Ignatovich V.K., Fizika Ultrakholodnykh Neitronov (Nauka, Moscow, 1986) [in Russian]; The Physics of Ultracold Neutrons (Clarendon, Oxford, 1990)
5. Golub R., Richardson D.J., Lamoreaux S., Ultracold Neutrons (Adam Hilger, Bristol, 1991)