41
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43
by Bein, Thomas
Published in Arbitrium (2001)
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44
45
46
47
by Bein, A. M.
Published in Children & Schools (1999)
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48
50
54
by Feng, S., Bein, T.
Published in Nature (1994)
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55
56
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58
by Bein, Thomas
Published in Arbitrium (1987)
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59