1. A. P. Cracknell and K. C. Wong, The Fermi Surface, Its Concept, Determination, and Use in the Physics of Metals (Clarendon, Oxford, UK, 1973), p. 300.
2. B. A. Volkov and O. A. Pankratov, JETP Lett. 42, 178 (1985).
3. S. N. Molotkov and V. V. Tatarskii, Poverkhnost’, Fiz., Khim., Mekh., No. 5, 17 (1988).
4. S. N. Molotkov and M. I. Ryzhkin, JETP Lett. 102, 189 (2015).
5. M. Franz and L. Molenkamp, in Contemporary Concepts of Condensed Matter Science, Ed. by E. Burstein, A. H. MacDonald, and P. J. Stiles (Elsevier, Oxford, UK, 2013), Vol. 6, pp. 11, 35, 143.