1. A new fossil resin with biological inclusions in Lower Cretaceous deposits from Álava (northern Spain, Basque-Cantabrian Basin);Alonso;Journal of Paleontology,2000
2. El ámbar de Asturias (España);Arbizu;Estudios del Museo de Ciencias Naturales de Álava,1999
3. A new fossil oribatid mite, Archaeorchestes minguezae gen. nov., sp. nov. from the Spanish Lower Cretaceous amber. Description of a new family, Archaeorchestidae (Acariformes, Oribatida, Zetorchestoidea);Arillo;Mitteilungen aus dem Geologisch-Paläontologischen Institut der Universität Hamburg,2000
4. Second fossil oribatid mite from the Spanish Lower Cretaceous amber. Eupterotegaeus bitranslamellatus n. sp. (Acariformes, Oribatida, Cepheidae);Arillo;Acarologia,2002
5. New applications of light and electron microscopic techniques for the study of microbiological inclusions in amber;Ascaso;Journal of Paleontology,2003