Inequalities among eigenvalues of Sturm-Liouville problems. Eastham, M.S.P., Kong, Q., Wu, H., Zettl, A. (1999) Journal of Inequalities and Applications [electronic only]
Inequalities and eigenvalues of Sturm-Liouville problems near a singular boundary. Everitt, W.N., Marletta, M., Zettl, A. (2001) Journal of Inequalities and Applications [electronic only]
Inequalities for eigenvalue functionals. Karaa, Samir (1999) Journal of Inequalities and Applications [electronic only]
Infinitely many solutions for a boundary value problem with discontinuous nonlinearities. Bonanno, Gabriele, Bisci, Giovanni Molica (2009) Boundary Value Problems [electronic only]
Integrated density of states of self-similar Sturm–Liouville operators and holomorphic dynamics in higher dimension Christophe Sabot (2001) Annales de l'I.H.P. Probabilités et statistiques
Invariant transformations for the Sturm--Liouville operator. Vagharshakyan, A. (2005) Zapiski Nauchnykh Seminarov POMI
Inverse nodal problems for the Sturm-Liouville differential operators on a star-type graph. Yurko, V.A. (2009) Sibirskij Matematicheskij Zhurnal
Inverse spectral problems for nonlinear Sturm-Liouville problems. Shibata, Tetsutaro (2007) Electronic Journal of Differential Equations (EJDE) [electronic only]
Irregular Sampling and the Inverse Spectral Problem. Amin Boumenir (1999) The journal of Fourier analysis and applications [[Elektronische Ressource]]