Less, G.; Ó. Kovács, L. (2009). Typological versus morphometric separation of orthophragminid species in single samples – a case study from Horsarrieu (upper Ypresian, SW Aquitaine, France). Revue de Micropaléontologie. 52(4): 267-288.
Typological versus morphometric separation of orthophragminid species in single samples – a case study from Horsarrieu (upper Ypresian, SW Aquitaine, France)