@article {Wolter:1968-03-01T00:00:00:0015-749X:102, author = "Wolter, Karl E.", title = "Notes: A New Method for Marking Xylem Growth", journal = "Forest Science", volume = "14", number = "1", year = "1968-03-01T00:00:00", abstract = "A method has been developed for marking the position of the cambial zone and differentiating xylem during the growing season. Minute injury to the cambial zone with a micro needle causes aberrant cells to form; these cells are permanently retained as a mark within the annual ring. Results of a study on Pinus resinosa Ait. indicate that cells capable of responding to this marking method can be pinpointed to within two cells.", pages = "102-104", url = "http://www.ingentaconnect.com/content/saf/fs/1968/00000014/00000001/art00024" }