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Graphic correlation of the upper Eifelian to lower Frasnian (Middle-Upper Devonian) conodont sequences in the Spanish Central
Pyrenees and comparison with composite standards from other areas; Gouwy, S; Liao, J -C; Valenzuela-Rios, J I. Palaeontologia
Electronica vol. 19.3, 19.3.39A, 2016 p. 1-18,
https://doi.org/10.26879/669 
Open Access (ESS Cont.# 20150480)