Kopecký, M., & Kopecká, F. Recurrent sunspot groups and the visibility function.
Chicago Style (17th ed.) CitationKopecký, M., and F. Kopecká. Recurrent Sunspot Groups and the Visibility Function.
MLA (9th ed.) CitationKopecký, M., and F. Kopecká. Recurrent Sunspot Groups and the Visibility Function.
Warning: These citations may not always be 100% accurate.
