Funding for this research was provided by:
NSERC (RGPIN-2018-06487)
PRIN 2015 (Variational methods, with applications to problems in mathematical physics and geometry)
Article History
Received: 9 November 2019
Accepted: 17 January 2020
First Online: 14 February 2020
Compliances with ethical standard
:
: On behalf of all authors, the corresponding author states that there is no conflict of interest.