Solutions of f ' ' + A ( z ) f = 0 with prescribed sequences of zeros. Heittokangas, J.; Laine, I. — 2005 Acta Mathematica Universitatis Comenianae. New Series
Growth estimates for solutions of linear complex differential equations. Heittokangas, J.; Korhonen, R.; Rättyä, J. — 2004 Annales Academiae Scientiarum Fennicae. Mathematica