@article{CRGEOS_2012__344_1_50_0,
     author = {Josep Maria Casas and Teodoro Palacios},
     title = {First biostratigraphical constraints on the {pre-Upper} {Ordovician} sequences of the {Pyrenees} based on organic-walled microfossils},
     journal = {Comptes Rendus. G\'eoscience},
     pages = {50--56},
     publisher = {Elsevier},
     volume = {344},
     number = {1},
     year = {2012},
     doi = {10.1016/j.crte.2011.12.003},
     language = {en},
}