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Rostislav Grigorchuk, Mathematics Department, Texas A&M University, College Station, TX 77843-3368, USA,
Daniel Lenz, Mathematisches Institut, Friedrich Schiller Universität Jena, 07743 Jena, Germany,
Tatiana Nagnibeda, Section de Mathématiques, University of Geneva, 2-4, Rue du Lièvre, Case Postale 64, 1211 Genève 4, Suisse
Andrei Malyutin, St. Petersburg Department of V.A. Steklov Mathematical Institute, Fontanka 27, 191023, St. Petersburg, Russia,
Tatiana Nagnibeda, Section de Mathématiques, University of Geneva, 2-4 Rue du Lièvre, Case Postale 64, 1211 Genève 4, Suisse,
Denis Serbin, Department of Mathematical Sciences, Stevens Institute of Technology, 1 Castle Point on Hudson, Hoboken, NJ 07030, USA