Funding for this research was provided by:
Russian Science Foundation (17-11-01064)
INDAM-GNAMPA (Operatori e disuguaglianze integrali in spazi con simmetrie)
PRIN (Varietà reali e complesse: geometria, topologia e analisi armonica)
Article History
Received: 5 November 2018
Revised: 14 March 2019
Accepted: 12 May 2019
First Online: 23 July 2019
Compliance with ethical standards
:
: The authors declare no conflict of interest.