Paul Cernea, Daniel Guan, “Killing fields generated by multiple solutions to the Fischer–Marsden equation”, Int. J. Math., 26, № 04, 2015, 1540006
V. M. Gichev, “Metric properties in the mean of polynomials on compact isotropy irreducible homogeneous spaces”, Anal.Math.Phys., 3, № 2, 2013, 119
Sol Schwartzman, “Schrödinger Operators and the Zeros of Their Eigenfunctions”, Commun. Math. Phys., 306, № 1, 2011, 187
Harold Donnelly, “Winding numbers and eigenfunctions of the Laplacian”, Ann Glob Anal Geom, 44, № 1, 2013, 1