1. Lepidopteris ottonis (Göpp.) Schimp. and Antholithus zeilleri Nath;Antevs;Kungliger Svenska Vetenskapsakademiens Handlingar,1914
2. Fossil plants and the Triassic–Jurassic boundary;Ash,1986
3. Lepidopteris ottonis (Goepp.) Schimp. and Peltaspermum rotula Harris from the Rhaetian of Poland;Barbacka;Acta Palaeobotanica,1991
4. Changes in the stomatal density of Betula nana leaves in response to increases in atmospheric carbon dioxide concentration since the late-glacial;Beerling;Special Papers in Palaeontology,1993
5. Stomatal density and index: theory and application;Beerling,1999