Second international competition for young opera singers, Sofia 1963 - Criese, Gladys; Pagliazzi, Franco; Pakoulska, Krystyna; Kniplová, Naděžda, 1932-; Stefanov, Vasil, 1913-1991; Kolasis, B.; Saint-Saëns, Camille, 1835-1921; Verdi, Giuseppe, 1813-1901; Verdi, Giuseppe, 1813-1901; Wagner, Richard, 1813-1883; Smetana, Bedřich, 1824-1884; Bizet, Georges, 1838-1875; et al. (Balkanton, 1966)