| MATHEMATICS | | |
| Aleksandar Torgašev | Spectrum of the line graph of a complete bipartite infinite graph | 5 |
| Aleksandar Torgašev | Tangent spheres of a Hilbert space simplex | 11 |
| Ivan Gutman | A theorem on graphs with maximum singularity | 17 |
| Miodrag M. Spalević | Product of Turán quadratures for ellipse and regions bounded by orthogonal parabolas | 21 |
| Zdravko F. Starc | A transformation of the independent variable for the second order linear ordinary differential equations | 29 |
| M. O. Ojo | A simple approximation to the maximum likelihood solutions in analyzing bioassay data | 35 |
| Olga Miljković | Fuzzy logic and simulation of descrete stochastic systems | 41 |
| Ljubica R. Lalović | Approximation of generalized solutions of the tird boundary value problem for elliptic equation with variable coefficients | 53 |
| PHYSICS | | |
| Ljubisav Novaković | Exact and approximate solutions of the helium-atom problem | 67 |
Vukota Babović Milan Kovačević | An estimation of the plasma column length in a discharge of the surfatron type | 85 |
| CHEMISTRY | | |
A. A. Kiss G. Katona M. V. Diudea | Szeged and Cluj matrices within the matrix operator W (M1, M2, M3) | 95 |
| BIOLOGY | | |
Snežana D. Maletić Ljiljana M. Dragićević-Đoković Ivana Banić Slađan Z. Pavlović Radoslav V. Žikić Milosav M. Kostić | The effects of hydrogen-peroxide on rat reticulocyte energy metabolism | 109 |