1. On boundedness of solutions of second order differential equations in the limit circle case;Kwong,1975
2. L2-solutions of y″ = q(t)y and a functional equation;Neuman;Aequationes Math.,1971
3. Geometrical approach to linear differential equations of the nth order;Neuman;Rend. Mat.,1972
4. On a problem of transformations between limit-circle and limit-point differential equations;Neuman,1973
5. On two problems about oscillation of linear differential equations of the third order;Neuman;J. Diff. Equations,1974