1
Published in 1980
doi: 10.1306/BF9AB5B4-0EB6-11D7-8643000102C1865D
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3
Published in 1981
doi: 10.1306/212F7CBB-2B24-11D7-8648000102C1865D
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12
Published in 1982
doi: 10.1306/212F7EE6-2B24-11D7-8648000102C1865D
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