Ben, T., P. J. Hart, and G. Helle. “Towards Establishing a New Environmental Archive – Annual Growth Periodicity, Stable Carbon Isotope Variability and Reconstruction Potential of ’Akoko (Euphorbia olowaluana), a Native Hawaiian Tree With C4 Photosynthetic Pathway”. ERDKUNDE, vol. 71, no. 1, Mar. 2017, pp. 77-92, doi:10.3112/erdkunde.2017.01.05.