Altunina, А.Matvieieva, T.Chursanova, M.2022-06-222022-06-222021Altunina, А. Optimal size ratio of a passe-partout and a watercolor / Altunina А., Matvieieva T. V., Chursanova M. V. // Modern engineering and innovative technologies. – 2021. – Issue 17, Part 1. – P. 89-94.https://ela.kpi.ua/handle/123456789/48051en"golden ratio"“golden section”the size of the passe-partout and watercolorShannon's formulaharmonic ratioArticleP. 89-94629.2380000-0003-4079-49010000-0001-6977-7473