1. Boron in Swedish and Norwegian freshwaters;Ahl;Ambio,1972
2. Standard methods for the examination of water and wastewater;Apha,1971
3. Water Plants;Arber,1920
4. Characteristics of boron. I. Concentrations in surface waters, rainfall and aquatic plants;Bingham;Am. Midl. Nat.,1970
5. Studies of the biogeochemistry of boron. I. Concentrations in surface waters, rainfall and aquatic plants;Boyd;Am. Midl. Nat.,1972