Francis, M. L.; Ellis, F.; Lambrechts, J. J. N.; Poch, R. M. (2013-01-01). "A micromorphological view through a Namaqualand termitaria (Heuweltjie, a Mima-like mound)". CATENA. 100: 57–73. doi:10.1016/j.catena.2012.08.004. ISSN0341-8162.
Francis, Michele Louise; Ellis, Freddie; V. Fey, Martin; Poch, Rosa María (2014-09-05). "Petroduric and 'petrosepiolitic' horizons in soils of Namaqualand, South Africa". Spanish Journal of Soil Science. 2: 142. doi:10.3232/SJSS.2012.V2.N1.01. hdl:10459.1/59295. ISSN2253-6574. S2CID220755679.
Francis, M.L.; Fey, M.V.; Prinsloo, H.P.; Ellis, F.; Mills, A.J.; Medinski, T.V. (September 2007). "Soils of Namaqualand: Compensations for aridity". Journal of Arid Environments. 70 (4): 588–603. Bibcode:2007JArEn..70..588F. doi:10.1016/j.jaridenv.2006.12.028.
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Francis, Michele Louise; Ellis, Freddie; V. Fey, Martin; Poch, Rosa María (2014-09-05). "Petroduric and 'petrosepiolitic' horizons in soils of Namaqualand, South Africa". Spanish Journal of Soil Science. 2: 142. doi:10.3232/SJSS.2012.V2.N1.01. hdl:10459.1/59295. ISSN2253-6574. S2CID220755679.
Francis, Michele Louise; Ellis, Freddie; V. Fey, Martin; Poch, Rosa María (2014-09-05). "Petroduric and 'petrosepiolitic' horizons in soils of Namaqualand, South Africa". Spanish Journal of Soil Science. 2: 142. doi:10.3232/SJSS.2012.V2.N1.01. hdl:10459.1/59295. ISSN2253-6574. S2CID220755679.
Francis, M. L.; Ellis, F.; Lambrechts, J. J. N.; Poch, R. M. (2013-01-01). "A micromorphological view through a Namaqualand termitaria (Heuweltjie, a Mima-like mound)". CATENA. 100: 57–73. doi:10.1016/j.catena.2012.08.004. ISSN0341-8162.
Francis, Michele Louise; Ellis, Freddie; V. Fey, Martin; Poch, Rosa María (2014-09-05). "Petroduric and 'petrosepiolitic' horizons in soils of Namaqualand, South Africa". Spanish Journal of Soil Science. 2: 142. doi:10.3232/SJSS.2012.V2.N1.01. hdl:10459.1/59295. ISSN2253-6574. S2CID220755679.