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21
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22
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23Published 1988“...HQ 809.3 .U5 .C783...”
Conference Proceeding Book -
24Published 1989“...HD 2766 .P9762...”
Book -
25
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26
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27
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28
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29
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30
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31
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32
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33Published 1995“...HD 2795 .C374...”
Book -
34
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35
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36Published 1998“...HD 5708.5 .U6 .J62...”
Book