1. On point interactions in one dimension;Albeverio;J. Operator Theory,1984
2. Deficiency indices of a differential operator satisfying certain matching interface conditions;Baruah;Electronic J. Differential Equations,2005
3. Characterization of the resolvent of a differential operator generated by a pair of singular ordinary differential expressions satisfying certain matching interface conditions;Baruah;Int. J. Mod. Math.,2006
4. The spectrum of differential operators with almost constant coefficients II;Behncke;J. Comput. Appl. Math.,2002
5. Spectral analysis of fourth order differential operators I;Behncke;Math. Nachr.,2006