Key points are not available for this paper at this time.
Fatka, Oldřich, Kraft, Petr, Szabad, Michal (2011): Shallow-Water Occurrence ofWiwaxiain the Middle Cambrian of the Barrandian Area, Czech Republic. Acta Palaeontologica Polonica 56 (4): 871-875, DOI: 10.4202/app.2009.0052, URL: http://dx.doi.org/10.4202/app.2009.0052
Fatka et al. (Thu,) studied this question.