NECESSARY CONDITIONS FOR EXTREMAL SOLUTIONS OF A TWO-DIMENSIONAL DIRICHLET PROBLEM; pp. 1–6

MODEL MATCHING OF NONLINEAR DISCRETE TIME SYSTEMS IN THE PRESENCE OF DISTURBANCES; pp. 7–24

MASSLESS HALF-ODD-INTEGER HELICITY GAUGE FIELDS; pp. 25–36

A FEW COMMENTS ON v_e ↔ v_τ OSCILLATION PARAMETERS; pp. 37–41

POLARITON EFFECTS IN THE ONE-PHONON RESONANT SCATTERING OF MÖSSBAUER RADIATION; pp. 42–48