Hello, I would like to know whether anybody made any progress on this. I tried to google and found nothing. Also, why is there nothing in Bibliography of this problem? Is there any paper involving or proposing it? Thanks in advance

## Is there yet any progress on this problem?

Hello, I would like to know whether anybody made any progress on this. I tried to google and found nothing. Also, why is there nothing in Bibliography of this problem? Is there any paper involving or proposing it? Thanks in advance