VOLUME 12, ISSUE 1, NOVEMBER 2012, PAGES 1-70

TWO LOWER BOUNDS OF THE ESTRADA INDEX OF A HERMITIAN MATRIX

SI’LNIKOV HETEROCLINIC ORBITS IN A 4D CUBIC SYSTEM

PYTHAGOREAN RELATIONS IN JORDAN MEASURABLE SETS

NAVARRO BLOCK CONJECTURE FOR M₁₁ AND A PROBLEM

HOMOCLINIC SOLUTIONS FOR A CLASS OF NONEVEN SECOND ORDER HAMILTONIAN SYSTEMS

THE THIRD AND THE AUTOMATIC HOMOTOPY EXACT SEQUENCE OF A FIBRATION IN MODULE THEORY

INVESTIGATING THE DIFFUSION OF RENEWABLE ENERGY TECHNOLOGIES IN ITALY