Rosa zalana Wiesb. (Rosaceae) u hrvatskoj flori

This communication gives the information that Rosa zalana belongs to the flora of Croatia. This species was discovered as far back as 1884 by Ljudevit Vukotinović in the neighborhood of Varaždinske Toplice. This is the southernmost locality of this Central European species.U radu se objavljuje podatak da je vrsta Rosa zalana pripadnik hrvatske flore. Otkrio ju je još davne 1884. godine Ljudevit Vukotinović u okolici Varaždinskih Toplica. To je ujedno i najjužnije nalazište navedene srednjoeuropske vrste

Graph Theory and Molecular Orbitals. IV. Further Application of Sachs Formula

In the present note we would like to report a further application1 of the Sachs formula2 to conjugated hydrocarbons

Graph Theory and Molecular Orbitals. XVI. on π-Electron Charge Distribution

An integral formula is derived exhibiting the dependence of the π-electron charge density (in the framework of Huckel theory) on the coefficients of the characteristic polynomial of the molecular graph and one of its subgraphs. Several simple consequences of this formula are demostrated