1. V. L. Makarov, Difference Schemes with Exact and Explicit Spectra [in Russia], Doctoral-Degree Thesis (Physics and Mathematics) Kiev (1976).
2. V. L. Makarov and T. Arazmyradov, “On the construction of particular solutions of resonant differential equations,” Differents. Uravn., 14, No. 7, 1255–1261 (1978).
3. N. B. Backhouse, “The resonant Legendre equation,” J. Math. Anal. Appl., 117, No. 2, 310–317 (1986).
4. V. L. Makarov, “FD-method—exponential rate of convergence,” Zh. Obchysl. Prykl. Mat., No. 82, 69–74 (1997).
5. N. B. Backhouse, “Resonant equations and special functions,” J. Comput. Appl. Math., 133, No. 1-2, 163–169 (2001).