Global solution to a Hopf equation and its application to non-strictly hyperbolic systems of conservation laws. Mitrovic, Darko; Susic, Jela — 2007 Electronic Journal of Differential Equations (EJDE) [electronic only]
Boundary Behavior of Subharmonic Functions on the Unit Disk Žarko Pavićević; Jela Šušić — 1998 Matematički Vesnik