Eigenvalue approximations for linear periodic differential equations with a singularity.
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Harris, B.J., Marzano, F. (1999)
Electronic Journal of Qualitative Theory of Differential Equations [electronic only]
Ji, Jun, Yang, Bo (2006)
Advances in Difference Equations [electronic only]
Chyan, Chuan Jen, Davis, John M., Henderson, Johnny, Yin, William K.C. (1998)
Electronic Journal of Differential Equations (EJDE) [electronic only]
Dwyer, H.I., Zettl, A. (1995)
Electronic Journal of Differential Equations (EJDE) [electronic only]
Brigitte Beekmann, Hermann Lökes (1990)
Manuscripta mathematica
Leonid Friedlander (2005)
Annales de l’institut Fourier
We establish the sharp lower bound for eigenvalues of a metric graph.
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