Bad link. FFS ALWAYS check if the links you post anywhere works! - I'm senior webdev and know the importance of always checking posted links. Learned the hard way.

I can with wizardry deduct the right url from the bad double url, but would be better if the link is corrected so anyone can view the link you posted.

EDIT: (If) you can not edit the OP then delete it and make new better one.

EDIT2: I need to register to read the paper!