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Papp, György és Tolvaj, László és Barta, Edit (1999) Changes in DRIFT Spectra of Silver Maple and Lignin Extracted from the same Wood Caused by 248.5 nm Laser. In: ICWSF’99 Conference, 1999.07.14-1999.07.16, Great Missenden.
Tolvaj, László és Papp, György (1999) Outdoor Weathering of Impregnated and Steamed Black Locust. In: ICWSF’99 Conference, 1999.07.14-1999.07.16, Great Missenden.