Schweingruber, F. H., Briffa, K. R., & Nogler, P. (1993). A tree-ring densitometric transect from Alaska to Labrador. Comparison of ring-width and maximum-latewood-density chronologies in the conifer belt of northern North America. International Journal of Biometeorology, 37(3), 151-169. https://doi.org/10.1007/Bf01212625