1. M. Fremantle, Introduction to Ionic Liquids (Royal Society of Chemistry, Cambridge, 2009)
2. L.A. Aslanov, M.A. Zakharov, N.L. Abramycheva, Ionic Liquids in a Line of Solvents (MSU Publishing Co, Moscow, 2005)
3. G.I. Likhtenstein, The Method of Spin Labels in Molecular Biology (Nauka, Moscow, 1974)
4. L.J. Berliner (ed.), Spin Labeling. Theory and Applications (Academic Press, New York, 1976)
5. A.N. Kuznetsov, The Method of Spin Probes (Nauka, Moscow, 1976)