A. Glebe and Hoffmann (1979)
B. Melchers et al (1978)
C. Sam Norum (1976)
D. Guha and Maheshwari (1974)
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A. Glebe and Hoffmann (1979)
B. Melchers et al (1978)
C. Sam Norum (1976)
D. Guha and Maheshwari (1974)
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