Pygostylia and Oviraptorosauria

["David Marjanovic" <david.marjanovic@gmx.at>]

Don't be afraid, this isn't another thread on phylogeny. :-) This time I
just want to know who defined Pygostylia as {*Confuciusornis* + Neornithes}
and when. It must have been in 1999. Searching the archives gives 122
matches, but none contains this information. (I have searched 3 times
because there's a bug in the engine -- one can only see 100 messages, the
other results are not accessible.)
        I'd also like to know if there's any published version of the
commonly used stem-based non-definition of Oviraptorosauria which includes
*Microvenator*, *Nomingia*, *Caudipteryx* and probably *Protarchaeopteryx*,
considering that the official definition is {*Oviraptor* + *Chirostenotes*}
Sues, 1997 -- why has this clade got the name Caenagnathoidea, and when? --,
and that the only other definition I can find in the literature is
{*Oviraptor* > Neornithes} Sereno, 1998.
        Many thanks in advance. :-)