Retraction Retraction dated 2019-04-08

Article History

Received: 9 May 2017

First Online: 3 August 2018

Change Date: 8 April 2019

Change Type: Erratum

Change Details: This article [1] has been retracted by the Editor-in-Chief, because, by some technical mistake, it has been published twice: originally in issue 1 of the same journal [2]. The Editor-in-Chief and the publisher apologize for any inconvenience. The authors agree to this retraction.<OrderedList><ListItem><ItemNumber>1.</ItemNumber><ItemContent><Para>L. Primachuk and S. Rogosin, Lobachevskii J.Math. <Emphasis Type="Bold">39</Emphasis> (6), 809–817 (2018). doi 10.1134/S1995080218060148</Para></ItemContent></ListItem><ListItem><ItemNumber>2.</ItemNumber><ItemContent><Para>L. Primachuk and S. Rogosin, Lobachevskii J.Math. <Emphasis Type="Bold">39</Emphasis> (1), 129–137 (2018). doi 10.1134/S1995080218010213</Para></ItemContent></ListItem></OrderedList>