KOLLMANN, F. Technologie des Holzes und der Holzwerkstoffe. 1951, 1, 910-926
Japan Industrial Standards Committee. Methods of test for wood JIS Z 2101. 1994
HIRATA, S. Development of a portable Brinell's hardness tester for wood. J Jpn Soc Tech Educ. 1996, 39, 185-190
Japanese Patent Office. Portable Brinell's hardness meter for timber. patent 2853029. 1998
OHTA, S. The observation of tree ring structure by soft X-ray densitometry. 1. The effects of air pollution on annual ring structure. Mokuzai Gakkaishi. 1978, 24, 429-434