1. Poole, C.P., Experimental Techniques in Electron Spin Resonance, New York: Wiley, 1967. Translated under the title Tekhnika EPR-spektroskopii, Moscow: Mir, 1970.
2. Swartz, H.M. and Clarkson, R.B., Phys. Med. Biol., 1998, vol. 43, no. 7, p. 1957.
3. Andrew, E.R., Nuclear Magnetic Resonance, Cambridge: Cambridge Univ. Press, 1955. Translated under the title Yadernyi magnitnyi rezonans, Moscow: Inostrannaya Literatura, 1957.
4. Losche, A., Kerninduktion (Nuclear Induction), Berlin: Deutsche Verlag der Wissenschaften, 1957. Translated under the title Yadernaya induktsiya, Moscow: Inostrannaya Literatura, 1963.
5. Shitikov, G.T., Stabil’nye diapazonnye avtogeneratory (Stable Variable-Frequency Self-Excited Oscillators), Moscow: Sov. Radio, 1965, p. 217.