EPA:10.2216/i0031-8884-19-2-96.1
EPA:10.2216/i0031-8884-32-1-48.1
EPA:10.2216/i0031-8884-34-5-417.1
EPA:10.2216/i0031-8884-35-3-245.1
EPA:10.2216/i0031-8884-42-4-324.1