RT Journal Article SR Electronic T1 The Effect of Low Temperature on Ascent of Sap in Trees JF Plant Physiology JO Plant Physiol. FD American Society of Plant Biologists SP 568 OP 572 DO 10.1104/pp.39.4.568 VO 39 IS 4 A1 Zimmermann, Martin H. YR 1964 UL http://www.plantphysiol.org/content/39/4/568.abstract AB