"Radial variation"@en . "26aac41158c322c05ac1e668436a06a9" . "Thinning"@en . "Citra Yanto Ciki" . "Oak"@en . "Purba" . . "Citra Yanto Ciki Purba" . "Mechanical properties"@en . "Beech"@en . "Ring properties"@en . . .