Unipro Center for Information Technologies, Novosibirsk, Russia. ugene@unipro.ru|Unipro Center for Information Technologies, Novosibirsk, Russia. ugene@unipro.ru|Unipro Center for Information Technologies, Novosibirsk, Russia. ugene@unipro.ru|Unipro Center for Information Technologies, Novosibirsk, Russia. ugene@unipro.ru