1. On the nonuniqueness of positive solutions for a class of superlinear problems, 9th AIMS International Conference on Dynamic Systems and Differential Equations, Orland, Florida, USA, July 3, 2012.
  2. Exact multiplicity of positive solutions for a class of two-point boundary value problems with one-dimensional p-Laplacian, 2012 International Workshop on Nonlinear PDE and Applications, Busan, Republic of Korea, February 10, 2012.
  3. Rectifiable and fractal oscillations of second-order linear differential equations, International Symposium on Nonlinear Analysis and Optimization 2012, Busan, Republic of Korea, February 9, 2012.
  4. Nonuniqueness of positive solutions of two-point boundary value problems for superlinear equations, Equadiff 2011, Loughborough, UK, August 2, 2011.
  5. Rectifiable and fractal oscillations of self-adjoint second-order linear differential equations, International Workshop on Geometric and fractal analysis of PDEs and differential systems in Zagreb 2011, Zagreb, Croatia, July 29, 2011.
  6. On the nonuniqueness of positive solutions of two-point boundary value problems for superlinear equations, 2011 International Workshop on Nonlinear PDE and Applications, Busan, Republic of Korea, June 21, 2011,
  7. Uniqueness of positive radial solutions of superlinear elliptic equations in a ball, 8th AIMS International Conference on Dynamic Systems and Differential Equations, Dresden, Germany, May 27, 2010.
  8. Uniqueness and nonuniqueness of positive solutions for two-point boundary value problems of Emden-Fowler equations, Japan-Korea Joint Workshop on Dynamical Systems and Related Topics, Busan, Republic of Korea, March 3, 2010.
  9. On the uniqueness of positive solutions of two-point BVPs of Emden-Fowler equations, Second Chile-Japan Workshop on Nonlinear Elliptic and Parabolic PDE, Tokyo, Japan, December 3, 2009.
  10. On the uniqueness of positive solutions for two-point boundary value problems of Emden.Fowler di erential equations, Equadiff 12, Brno, Czech Republic, July 23, 2009.
  11. Uniqueness of positive solutions for two-point boundary value problems of Emden-Fowler differential equations, International Workshop on Nonlinear PDE and Applications, Busan, Republic of Korea, July 1, 2009.
  12. An identity for BVPs with the one-dimensional p-Laplacian and its applications to the uniqueness of solutions, Intensive Lecture Program and International Conference on Nonlinear PDE and Applications, Busan, Republic of Korea, June 13, 2008.
  13. On the uniqueness of nodal radial solutions of sublinear elliptic equations in a ball, 7th AIMS International Conference on Dyn. Systems, Diff. Equations and Applications, Arlington Texas USA, May 21, 2008.
  14. An identity for ordinary differential equations with the one-dimensional p-Laplacian and its applications to boundary value problems, Equadiff 07, Vienna Austria, August 10, 2007.
  15. On the existence of solutions with prescribed numbers of zeros of two-point boundary value problems for the one-dimensional p-Laplacian, Conference on Differential & Difference Equations and Applications, Melbourne Florida USA, August 2, 2005.
  16. Existence of solutions with prescribed numbers of zeros of two-point boundary value problems for the one-dimensional p-Laplacian, EQUADIFF 11, Bratislava Slovakia, July 26, 2005.