D. F. Yeatts, «Tree Shape and Branch Structure: Mathematical Models», Math. Comput. For. Nat. Res. Sci., vol. 4, fasc. 1, pp. 2–15 (14), feb. 2012, Consultato: nov. 13, 2026. Disponibile su: https://mcfns.com/index.php/Journal/article/view/4.2