The information included on this page is not intended to cover every reference to Frailea in print, but to provide a listing of scientific papers, and journal articles in which the genus is mentioned. A number of papers are available on line, more will follow.

• Cumprimentos da foto do pampa 7. Angela & Frederico Jaekel. Internoto Volume 28, no. 3, 2007.
• Gymnocalycium in Argentijns laagland. Ludwig Bercht. Succulenta (Netherlands) 75(2): 62-66, 1996.
• Interessante cactusgebieden in Bolivia (Slot). A. F. H. Buining. Succulenta (Netherlands) 55(4): 66-69, 1976.
• Nieuwe combinaties en namen voor cactussen uit Brazilie, Bolivia en Paraguay. Pierre J. Braun en Eddie Esteves Pereira. Succulenta (Netherlands) 74 (3): 130-135, 1995.
• Notiz aus der Provinz Corrientes Argentinien - Teil 1. Fabian Font. Internoto Volume 28, no. 1, 2007.
• Notocactus buiningii (Buxbaum) F. Ritter ist ein interessanter Kaktus. Stanislav Stuchlik. Internoto 27(3), 2006.
• Op de groeiplaats van Notocactus polyacanthus (Link & Otto) Theunissen. Norbert Gerloff. Succulenta (Netherlands) 70(2): 27-30, 1991.
• Op zoek naar Notocactus harmonianus Ritter. Norbert Gerloff. Succulenta (Netherlands) 73(4): 180-186, 1994.
• Pedra do Segredo, ein touristischer Anziehungspunkt in der Serra das Encantadas. Horst-H. Henßen. Internoto Volume 28, no. 2, 2007.
• Tijdschriften. Ton Pullen.Succulenta (Netherlands) 72(5): 211-213, 1993.