SOVIET WILL JOIN PARLEY OF ENVOYS ON AUSTRIAN PACT; Agrees to Confer in Vienna Monday -- U.S. Now Looks for Treaty Next Month SOVIET WILL JOIN IN TALK BY ENVOYS
USSR agrees to meeting of Big-4 Ambs May 2, preliminary to Big-4 foreign mins conf, notes to West; sees no need for Ambs meeting, but agrees to it; US sees treaty signing in May; Austrians pleased; Deputy Min Kreisky sees neutrality guarantees given after treaty signing