TY JOUR TI Theoretical and legal analysis of the legal definition of the concept of “unclaimed land share” KW unclaimed land share KW definition of concept KW extortion property KW municipal property KW heirs JO Legal Science and Practice: Journal of Nizhny Novgorod Academy of the Ministry of Internal Affairs of Russia AU Rumyantsev, F.P. PY 2023 IS 2023 PB Nizhny Novgorod Academy of the Ministry of the Interior of Russia