THIESSEN, Reinhardt. Physical Structure of Coal, Cellulose Fibre and Wood as Shown by Spierer Lens. Indian Forester, [S. l.], v. 59, n. 11, p. 724–729, 1933. DOI: 10.36808/if/1933/v59i11/20460. Disponível em: http://indianforester.co.in/index.php/indianforester/article/view/20460. Acesso em: 6 dec. 2025.