1. Sobolev Institute of Mathematics, Novosibirsk State University, Novosibirsk 630090, Russia
2. Laboratory of Quantum Topology, Chelyabinsk State University, Brat'ev Kashirinykh Street 129, Chelyabinsk 454001, Russia
3. Laboratoire de Mathématiques Nicolas Oresme, CNRS UMR 6139, Université de Caen BP 5186, F-14032 Caen, France