41
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Published 1980
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42
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Published 1981
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43
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Published 1990
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44
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Published 1975
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45
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Published 1975
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46
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47
by Karpilovsky, Gregory
Published 1995
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48
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49
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Published 1984
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50
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Published 1951
Elsevier Science

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by Sierpinski, Waclaw
Published 1988
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54
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Published 1983
Academic Press

56
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57
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58
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