Asyov, B.; Petrova, A.; Dimitrov, D.; Vasilev, R., Conspectus of the Bulgarian vascular flora. Distribution maps and floristic elements. Bulgarian Biodiversity Foundation, Sofia, 2012 (in Bulgarian).
Bratanova-Doncheva, S.; Gocheva K., Advisory Services on a National Climate Change Adaptation Strategy and Action Plan, Appendix 2: Assessment of the Biodiversity and Ecosystems Sector, World Bank, Ministry of Environment and Water, 2018.
Delipavlov, D.; Cheshmedzhiev, I.; Popova, M.; Teriyski, D.; Kovachev, I., Handbook for Plants in Bulgaria. Publishing House of Agricultural University, Plovdiv, 2011 (in Bulgarian).
Dodd, A.P. The Biological Control of Prickly Pear in Australia. In: Keast, A., Crocker, R.L., Christian, C.S. (eds) Biogeography and Ecology in Australia. Monographiae Biologicae. Springer, Dordrecht, 1959, https://doi.org/10.1007/978-94-017-6295-3_34.
Glogov, P.; Dimitrov, D. Influence of climate change on the spread of invasive alien plant species in the territory of the Lozenska Mountain. Ecological Engineering and Environment Protection, 2021, 1, 78-82.
Glogov, P.; Georgieva, M.; Pavlova, D.; Gyudorova, S.; Dodev, Y., Characteristics of the locality of Opuntia humifusa (Raf.) Raf. (Cactaceae) on the territory of the Lozenska Mountain, Forest Science, 2020, 1, 29-44 (in Bulgarian).
Glogov, P.; Pavlova, D.; Georgieva, M.; Kachova, V., Analysis of Anthropophitic Flora on the Territory of Lozenska Mountain, Bulgaria. Ecologia Balcanica, 2019, 11(2), 181-191.
Gorelick, R. Northern range llmjt of Opuntia fragilis and the Cactaceae is S6°N, not S8°N, Madroño,2015, 62(2), 115-123. JSTOR, http://www.jstor.org/stable/44577548. Accessed 14 Mar. 2023.
Kenderova, R. Report 49. In: New floristic records in the Balkans, Compiled by Vladimirov, V., F. Dane & K. Tan. Phytologia Balcanica, 2012, 18(2), 205-230.
Naydenova, T.; Vladimirov, V.; Bancheva, S., Contribution to the knowledge of naturalised Opuntia species (Cactaceae) in the Bulgarian flora. Phytologia Balcanica, 2019, 25(1), 39-46.
Petrova, A.; Vladimirov, V.; Georgiev, V., Invasive alien plant species in Bulgaria, Institute of Biodiversity and Ecosystem Research, BAS, Sofia, 2012.
Stoyanov, K.; Raycheva, Ts.; Cheschmedzhiev, I., Key to the native and foreign vascular plants in Bulgaria. Agricultural University Plovdiv Academic Press, Plovdiv, 2021 (in Bulgarian).
Tashev, A., Characteristics of the Opuntia humifusa (Cactaceae) locality in the Harmanli district, South Bulgaria. Phytologia Balcanica, 2012, 18(1), 11-16.
Website of the Ministry of Environment and Water of the Republic of Bulgaria, Opuntia – the treacherous cactus with beautiful flowers and delicious fruits, https://www.moew.government.bg/static/media/ups/tiny/filebase/Nature/Biodiversity/IAS/opuncia.pdf (in Bulgarian).
Westhoff, V.; Maarel, E., The Braun-Blanquet Approach In: Handbook of vegetation science (ed. Tuxen, R.), Dr. W. Junk b. v. Publishers the Hague, 1973.