Updates are available Correction dated 2019-01-08
Click to view Correction: https://doi.org/10.1007/s00010-018-0625-9
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Authors
Smirnov, Sergey N.
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Article History
Received: 15 February 2018
Revised: 4 May 2018
First Online: 2 July 2018
Change Date: 8 January 2019
Change Type: Correction
Change Details: A formally correct expression at the end of Section 2 is, however, of awkward form, being not what was intended (due to my inattentiveness) and it may confuse a careful reader.
