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1991, 11(2): 1-5. DOI: 1003-0964(1991)02-0001-05
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1991, 11(2): 6-12. DOI: 1003-0964(1991)02-0006-07
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1991, 11(2): 12-18. DOI: 1003-0964(1991)02-0012-07
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1991, 11(2): 19-24. DOI: 1003-0964(1991)02-0019-06
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1991, 11(2): 25-28. DOI: 1003-0964(1991)02-0025-04
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1991, 11(2): 29-34. DOI: 1003-0964(1991)02-0029-06
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1991, 11(2): 35-40. DOI: 1003-0964(1991)02-0035-06
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1991, 11(2): 45-51. DOI: 1003-0964(1991)02-0045-07
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1991, 11(2): 48-53. DOI: 1003-0964(1991)02-0048-06
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1991, 11(2): 54-59. DOI: 1003-0964(1991)02-0054-06
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1991, 11(2): 60-67. DOI: 1003-0964(1991)02-0060-08
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1991, 11(2): 68-73. DOI: 1003-0964(1991)02-0068-06
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1991, 11(2): 98-106. DOI: 1003-0964(1991)02-0098-09
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1991, 11(2): 80-86. DOI: 1003-0964(1991)02-0080-07
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1991, 11(2): 86-92. DOI: 1003-0964(1991)02-0086-07
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1991, 11(2): 93-94. DOI: 1003-0964(1991)02-0093-02
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1991, 11(2): 95-102. DOI: 1003-0964(1991)02-0095-08
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1991, 11(2): 98-104. DOI: 1003-0964(1991)02-0098-07
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1991, 11(2): 19-21. DOI: 1003-0964(1991)02-0019-03
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1991, 11(2): 108-112. DOI: 1003-0964(1991)02-0108-05
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