More details can be found in the works of Pelipas and Kirchner (2015a (in Russian only), 2015b (in Russian only)), Bezborodova (in Russian only: 2014a, 2014b).
Больш падрабязна можна азнаёміцца ў работах Пеліпася і Кірхнера (2015a, 2015b), Безбародавай (2014а, 2014b).