Ulay, Göksel, et al. “The Effect of Weathering on Color and Glossiness Properties of Polyurethane-Modified Water-Based Varnish Layers Applied to Thermally Treated Ash Wood”. BioResources, vol. 20, no. 3, July 2025, pp. 7555-73, https://ojs.bioresources.com/index.php/BRJ/article/view/24819.