found: Gramatika na zritelnoto, 2000:t.p. (Petŭr Uvaliev = Pierre Rouve)
found: OCLC (18 Oct 2000):(hdgs.: Rouve, Pierre; Uvaliev, Petŭr; usage: Pierre Rouve, Pierre Ouvaliev; writes in English, translates from English into French)
found: Bezgranichnii︠a︡t glas, 2003:t.p. (Petar Ouvaliev)
found: Filmovi trokhi, 2001:t.p. (Petŭr Uvaliev) p. 7 (Pier Ruv, 1915-1998; theater and film director; born in Bulgaria; emigrated in the 1940s)
found: Koleva, G., Knigi s darstveni nadpisi ot lichnata biblioteka na Petŭr Uvaliev, 2011:t.p. (Петър Увалиев = Petŭr Uvaliev)