1. Excelsior: 09.01.1942 Type: programme Subject: Butterfly / Premiere der Butterfly; Butterfly Language: Czech and German Description: 1/2 4, 6, 1/2 9. Rights: Creative Commons BY 4.0
2. Excelsior: 10.05.1940 Type: programme Subject: Butterfly / Premiere der Butterfly; Butterfly Language: Czech and German Description: Vom 10. - 16. Mai. Unser glänzendes Pfingstprogramm. Deutsche Version. Vorst. 1/4 4, 1/4 6, 1/4 8, 1/4 10. Vorvek. Sonn-und Feiertage v. 10 - 12 Uhr. Rights: Creative Commons BY 4.0