University of California Press, Berkeley: 99-149. Kielan-Jaworowska, Z. 1980. Absence of ptilodonoidean multituberculates in Asia and its paleogeographic implications. Lethaia, 13: 169-175. Fosse, G., Kielan-Jaworowska, Z. and Skaale, S.G. 1985. The microstructure of tooth enamel in multituberculate mammals. Palaeontology, 28: 435-449. Kielan-Jaworowska, Z., Presley, R. and Poplin, C. 1986. Cranial vascular system in taeniolabidoid multituberculate mammals. Transactions of the Royal Society of London, B. Biological Sciences, 313: 525-602. Kielan-Jaworowska, Z., Dashzeveg, D. and Trofimov, B.A., 1987. Early Cretaceous multituberculates from Asia and a comparison with British and North American Jurassic forms. Acta Palaeontologica Polonica, 32: 3-47. Kielan-Jaworowska, Z., Crompton, A.W. and Jenkins F.A. 1987. The origin of egg laying mammals. Nature, 326: 871-873. Hopson, J.A., Kielan-Jaworowska, Z. and Allin, E.F. 1989. The cryptic jugal in multituberculates. Journal of Vertebrate Paleontology, 9: 201-209. Kielan-Jaworowska, Z. and Nessov, L.A. 1990. On the metatherian nature of the Deltatheroida, a sister group of the Marsupialia. Lethaia, 23: 1-10. Kielan-Jaworowska, Z. and Ensom, P. 1992. Multituberculate mammals from the Purbeck Limestone Formation (Late Jurassic) of Southern England.