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  Author (up) Title Year Publication Volume Pages Links
E Friedmann Menstrual and lunar cycles 1981 140 350 details   openurl
Lawrence, B.K.; Fehr, W.R. Reproductive Response of Soybeans to Night Interruption1 1981 Crop Science 21 755 details   doi
Tinus, R. W. Effects of Extended Photoperiod on Southern Rocky Mountain Engelmann Spruce and Douglas-fir 1981 Tree Planters' Notes 32 details   url
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