A note on the singular Sturm-Liouville problem with infinitely many solutions. Kosmatov, Nickolai — 2002 Electronic Journal of Differential Equations (EJDE) [electronic only]
A symmetric solution of a multipoint boundary value problem at resonance. Kosmatov, Nickolai — 2006 Abstract and Applied Analysis
A boundary value problem of fractional order at resonance. Kosmatov, Nickolai — 2010 Electronic Journal of Differential Equations (EJDE) [electronic only]
Countably many solutions of a fourth order boundary value problem. Kosmatov, Nickolai — 2004 Electronic Journal of Qualitative Theory of Differential Equations [electronic only]
Semipositone m -point boundary-value problems. Kosmatov, Nickolai — 2004 Electronic Journal of Differential Equations (EJDE) [electronic only]
A note on the second order boundary value problem on a half-line. McArthur, Summer; Kosmatov, Nickolai — 2009 Electronic Journal of Qualitative Theory of Differential Equations [electronic only]
Solution matching for a three-point boundary-value problem on a time scale. Eggensperger, Martin; Kaufmann, Eric R.; Kosmatov, Nickolai — 2004 Electronic Journal of Differential Equations (EJDE) [electronic only]
Impulsive dynamic equations on a time scale. Kaufmann, Eric R.; Kosmatov, Nickolai; Raffoul, Youssef N. — 2008 Electronic Journal of Differential Equations (EJDE) [electronic only]