G. R. Demathieu and H. W. Oosterink. 1988. New discoveries of ichnofossils from the Middle Triassic of Winterswijk (the Netherlands). Geologie en Mijnbouw 67:3-17
Bibliographie (1)
G. R. Demathieu and H. W. Oosterink. 1988. New discoveries of ichnofossils from the Middle Triassic of Winterswijk (the Netherlands). Geologie en Mijnbouw 67:3-17