«Algebraic Difference Equations for Stand Height, Diameter, and Volume Depending on Stand Age and Site Factors for Estonian State Forests», Math. Comput. For. Nat. Res. Sci., bd. 1, nr. 2, s. 67–77 (11), aug. 2009, åpnet: nov. 01, 2026. Tilgjengelig på: https://mcfns.com/index.php/Journal/article/view/1.9