Proof of a hypothesis on some segments of harmonic series and a new hypothesis S. Simić — 1979 Matematički Vesnik
A Note on Shock Profiles in Dissipative Hyperbolic and Parabolic Models Srboljub S. Simić — 2008 Publications de l'Institut Mathématique
More About Singular Line Graphs of Trees M. C. Marino; I. Sciriha; S. K. Simić; D. V. Tošić — 2006 Publications de l'Institut Mathématique