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Poignant, A.; Mathieu, R.; Levy, A.; Cahuzac, B. (2000). Haynesina germanica (Ehrenberg), Elphidium excavatum (Terquem) l.s. and Porosononion granosum (d'Orbigny), marginal-littoral species of Foraminifera from the Central Aquitaine (SW France) in the Middle Miocene (Langhian). The problem of Elphidium lidoense Cushman. Revue de Micropaléontologie. 43(3): 393-405.
Poignant, A.; Mathieu, R.; Levy, A.; Cahuzac, B. (2000). Haynesina germanica (Ehrenberg), Elphidium excavatum (Terquem) l.s. and Porosononion granosum (d'Orbigny), marginal-littoral species of Foraminifera from the Central Aquitaine (SW France) in the Middle Miocene (Langhian). The problem of Elphidium lidoense Cushman. Revue de Micropaléontologie. 43(3): 393-405.
