Bailey, Irving W.; Shepard, H. B. (1915). "Sanio's Laws for the Variation in Size of Coniferous Tracheids". Botanical Gazette. 60: 66–71. doi:10.1086/331600. S2CID85193047.
Bailey, Irving W.; Shepard, H. B. (1915). "Sanio's Laws for the Variation in Size of Coniferous Tracheids". Botanical Gazette. 60: 66–71. doi:10.1086/331600. S2CID85193047.