Heat balance measurements - to quantify sap flow in thin stems only?

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Herzog, K. M., Thum, R., Zweifel, R., & Häsler, R. (1997). Heat balance measurements - to quantify sap flow in thin stems only? Agricultural and Forest Meteorology, 83, 75-94. https://doi.org/10.1016/S0168-1923(96)02355-6