The materials to the "black book" of the flora of the Crimean Peninsula.

Bagrikova, N. A., Skurlatova, M. V., (2021). Russian Journal of Biological Invasions 12(3), 244-257. Pleiades Publishing, Moscow, Russia. English language

New cactus records from Gran Canaria with a key to the opuntioid species now established in the Canary Islands (Spain).

Verloove, F., Rodríguez, Á. M., Salas-Pascual, M., Guiggi, A., (2018). Haseltonia 25, 115-124. Cactus & Succulent Society of America Inc, Claremont, USA. English language

About some morphological and morphometric features of Opuntia engelmannii subsp. lindheimeri (Cactaceae), naturalised in the "Cape Martyan" Nature Reserve (Crimea).

Bagrikova, N. A., Chichkanova, E. S., (2018). Nature Conservation Research 3(Suppl. 2), 54-65. Fund for Support and Development of Protected Areas, Saransk, Russia. Russian language

Exotic pest alert: cotton boll weevil.

Australia, Department of Primary Industries (DPI) (2015) External factsheets, New South Wales Government, Department of Primary Industries, Australia, English language

New records of Cactaceae from Gran Canaria (Canary Islands, Spain).

Verloove, F., Rodríguez, Á. M., Salas-Pascual, M., Guiggi, A., (2017). Haseltonia 23, 79-91. Cactus & Succulent Society of America Inc, Claremont, USA. English language

Opuntia engelmannii (prickly pear cactus)

Lusweti, A., Wabuyele, E., Ssegawa, P., Mauremootoo, J. (2011) External factsheets, BioNET-EAFRINET, English language

Potential global adaptivity of spinelles, progeny of Opuntia ficus-indica 1281 × O. lindheimerii 1250 as forage cultivars adapted to USDA cold hardiness zones 7 and 8.

Felker, P., Bunch, R. A., Borchert, D. M., Guevara, J. C., (2009). Acta Horticulturae(No.811), 333-342. International Society for Horticultural Science (ISHS), Leuven, Belgium. English language

Environmental influences on cactus pear fruit yield, quality and cold hardiness and development of hybrids with improved cold hardiness.

Wang, X., Felker, P., Paterson, A., (1997). Journal of the Professional Association for Cactus Development 2, 48-59. English language

Prickly pear cactus: a Texas rangeland enigma.

Hanselka, C. W., Paschal, J. C., (1991). Rangelands 13(3), 109-111. English language

Using remote sensing for detecting and mapping noxious plants.

Everitt, J. H., Escobar, D. E., Davis, M. R., (1995). Weed Abstracts 44(12), 639-649. English language