13 citations to https://www.mathnet.ru/rus/tm2564
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Makin A.S., “Irregular boundary value problems for the Sturm–Liouville operator”, Differential Equations, 38:5 (2002), 633–641
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Makin A.S., “Exact estimates for the root functions of a second order general elliptic operator”, Doklady Akademii Nauk, 358:5 (1998), 594–596
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Ramm A.G., “Mathematical Foundations of the Singularity and Eigenmode Expansion Methods (Sem and Eem)”, Journal of Mathematical Analysis and Applications, 86:2 (1982), 562–591