Nagel, W. A. 1904. G. P. Adams: On the Negative and Positive Phototropism of the Earthworm Allolobophora foetida (Sav.) as determined by Light of Different Intensities. Americ. Journ. of Physiology IX (Contrib. zool. Labor. Harvard College). 1903. Zeitschrift für Psychologie und Physiologie der Sinnesorgane 36: 461-462
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