[dinosaur] Neuquensaurus name availability?

Is Neuquensaurus a valid name, and if so what year gets attribution?

Powell 1992 doesn't indicate a type species or a new combination so it
fails the ICZN requirements for a valid replacement genus for pre-1999
names, and Powell 2003 lacks an indication it is a new name (attributes it
to Powell 1992). Unless Powell's thesis qualifies as a publication (went
through an editorial process before being released as print-on-demand) I
think Neuquensaurus might be a nomen nudum, which is really unfortunate
because its a good taxon.