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3. Appraisal of pyrolytic techniques on different forms of organic matter from a Cretaceous basement in Central Spain;Almendros;Org. Geochem.,1998
4. Characterization of different forms of organic matter in Upper Cretaceous levels from Cerro de La Mesa (Madrid, Spain);Álvarez-Ramis;Plant Cell Biol. Dev.,1995
5. A Frenelopsis with opposite decussate leaves from the Lower Cretaceous of Portugal;Alvin;Palaeontology,1978