Citation: P. Kenrick et al., Semblant land plants from the middle Ordovician of the Prague Basin reinterpreted as animals, PALAEONTOL, 42, 1999, pp. 991-1002
Citation: Y. Zhao et S. Bengtson, Embryonic and post-embryonic development of the Early Cambrian cnidarian Olivooides, LETHAIA, 32(2), 1999, pp. 181-195