1. Estudio de Frenelopsis oligostomata (Romariz) Alvin, procedente del Cretacico supérior de Torrelaguna (Madrid);Alvarez-Ramis;Estudios Geologicos,1981
2. Nouvelles observations au microscope électronique à balayage sur la cuticule de Frenelopsis oligostomata Romariz emend. Alvin 1977, du Crétacé supérieur de Torrelaguna (Province de Madrid);Alvarez-Ramis,1987
3. The conifer Frenelopsis and Manica in the Cretaceous of Portugal;Alvin;Palaeontology,1977
4. Reconstruction of a lower Cretaceous conifer;Alvin;Botanical Journal of the Linnean Society,1983
5. A Frenelopsis with opposite decussate leaves from the lower Cretaceous of Portugal;Alvin;Palaeontology,1978