105
107
Published in 1990
doi: 10.1306/BF9AB6C6-0EB6-11D7-8643000102C1865D
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110
Published in 1991
doi: 10.1306/BF9AB6EB-0EB6-11D7-8643000102C1865D
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111
Published in 1992
doi: 10.1038/356052a0
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113
Published in 1991
doi: 10.1016/0301-9268(91)90065-I
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