Flower, R., K. Keatings, M. Hamdan, and F. Hassan. “Stephanodiscus Ehr. Species from Holocene Sediments in the Faiyum Depression (Middle Egypt)”. Phytotaxa, vol. 127, no. 1, Aug. 2013, pp. 66–80, doi:10.11646/phytotaxa.127.1.10.