1. L.B.Bärs, P.A.Liuhto and T.O.Serén, ″A method for improving the accuracy in neutron fluence measurements in power reactors and its application in a WWER-440 nuclear power plant″. Kernenergie 27(1984)8, p.342–347.
2. F.Hegedüs et al, “Measurement of the activation cross-section of the reaction 93Nb(n/n’) 93mNb for 0-25 MeV neutrons.”, Proc. the advisory group meeting on nuclear data for reactor dosimetry, Vienna (Nov. 13 – 17, 1978)
3. J.P.Faris, “Adsorption of the elements frcm hydrofluoric acid by anion exchange,” Anal. Chem. 32(1960)4, p.520–522.
4. J.L.Hague et al, “Separation of Ti, W, Mo and Nb by ion exchange,” J. of Research of the N.B.S 53(1954)4, p. 262.
5. M.J.Cabell & I.Milner, “The quantitative separation and determination of Ta and Nb using anion exchange chromatography,” Anal. Chim. Acta 13(1955), p. 258–267.