C. G. Gibson
Department of Mathematics,
University of Liverpool, U.K.

Serguey Nikolaevitch Pozdnyakov
Department of Mathematics,
St. Petersburg State University of Electrical Engineering, RUSSIA.

Mircea Becheanu
Department of Algebraic Geometry, Topology and Computer Algebra,
University of Bucharest, ROMANIA.

Sergei Vladimirovich Borisenok
Faculty of Physics, Herzen State Pedagogical University,
St. Petersburg, RUSSIA.