Ewers, F.W. 1982. Secondary growth in needle leaves of Pinus longaeva (bristlecone pine) and other conifers: Quantitative data. American Journal of Botany 69: 1552-1559. [1] 11 Ocak 2020 tarihinde Wayback Machine sitesinde arşivlendi.
web.archive.org
Ewers, F.W. 1982. Secondary growth in needle leaves of Pinus longaeva (bristlecone pine) and other conifers: Quantitative data. American Journal of Botany 69: 1552-1559. [1] 11 Ocak 2020 tarihinde Wayback Machine sitesinde arşivlendi.