1. Brown, T.G. and Painter, B.A., US Patent Application 2003/0002834, 2003.
2. Heitmann, W. and Klein, K.F., US Patent 6490399, 2002.
3. Allan, D.C., Brown, J.T., Chacon, L.C., et al., US Patent Application 20030128955, 2003.
4. Plekhanov, V.G., Isotope engineering, Phys. Usp., 2000, vol. 43, no. 11, pp. 1147–1154. https://doi.org/10.1070/PU2000v043n11ABEH000264
5. Zhuravleva, L.M. and Plekhanov, V.G., RF Patent 2401813, 2010.