1. Maximal and extremal singular graphs

   • Irene Sciriha

   OriginalPaper 17 March 2012 Pages: 117 - 125

2. Optimality criteria without constraint qualifications for linear semidefinite problems

   • O. I. Kostyukova
   • T. V. Tchemisova

   OriginalPaper 30 March 2012 Pages: 126 - 143

3. Faces of faces of the acyclic Birkhoff polytope

   • L. Costa
   • E. A. Martins

   OriginalPaper 17 March 2012 Pages: 144 - 158

4. On induced matchings as star complements in regular graphs

   • P. Rowlinson

   OriginalPaper 17 March 2012 Pages: 159 - 163

5. Extremal norms of graphs and matrices

   • V. Nikiforov

   OriginalPaper 17 March 2012 Pages: 164 - 174

6. On least eigenvalues of bicyclic graphs with fixed number of pendant vertices

   • Zhongzhu Liu
   • Bo Zhou

   OriginalPaper 17 March 2012 Pages: 175 - 192

7. Some further bounds for the Q-index of nested split graphs

   • M. Anđelić
   • C. M. da Fonseca
   • D. V. Tošić

   OriginalPaper 17 March 2012 Pages: 193 - 199

8. Security of scale-free networks

   • M. Gała̧zka
   • J. Szymański

   OriginalPaper 17 March 2012 Pages: 200 - 209

9. The minimum weight t-composition of an integer

   • D. M. Cardoso
   • J. O. Cerdeira

   OriginalPaper 17 March 2012 Pages: 210 - 215

10. Approximating the maximum size of a k-regular induced subgraph by an upper bound on the co-k-plex number

    • C. J. Luz

    OriginalPaper 17 March 2012 Pages: 216 - 226

11. On hereditary properties of the class of graphs with convex quadratic stability number

    • D. M. Cardoso
    • V. V. Lozin

    OriginalPaper 17 March 2012 Pages: 227 - 232

12. Billiards, scattering by rough obstacles, and optimal mass transportation

    • A. Plakhov

    OriginalPaper 17 March 2012 Pages: 233 - 245

13. A generalization of chromatic polynomial of a graph subdivision

    • D. M. Cardoso
    • M. E. Silva
    • J. Szymański

    OriginalPaper 17 March 2012 Pages: 246 - 254