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by Ludvigsen; Sten R.
by Wasson, Barbara B.; Ludvigsen, Sten; Hoppe, Ulrich
by Balacheff, Nicolas; Ludvigsen, Sten; de Jong, Ton; et al.
by Wasson, B.; Ludvigsen, Sten; Hoppe, Ulrich
by Balacheff, Nicolas; Ludvigsen, Sten; Jong, Ton De; et al.
by Sten R. Ludvigsen
by B. Wasson; ?Sten Ludvigsen; ?Ulrich Hoppe