| Citation | Walker, P.A., 1998, Fleeting images. Dynamics of North Sea ray populations.. University of Amsterdam. 145 p. Ph.D. dissertation. |
| संदर्भ | 41305 Walker, P.A., 1998 |
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| Named Used as Valid | Raja clavata |
| Comment | Cited in Ref. 41250. Not actually seen. Valid name used similar to citing reference. |
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