3
Published in 1990
doi: 10.1144/pygs.48.1.1
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10
Published in 1993
doi: 10.1144/pygs.49.3.171
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16
Published in 2003
doi: 10.1144/pygs.54.3.129
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17
Published in 2002
doi: 10.1346/00098600260358111
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18
Published in 1992
doi: 10.1038/355117b0
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