http://physchem.ox.ac.uk/MSDS/PH/phosphorus_red.html (http://physchem.ox.ac.uk/MSDS/PH/phosphorus_red.html)
http://www.chemicalland21.com/arokorhi/industrialchem/inorganic/PHOSPHORUS.htm (http://www.chemicalland21.com/arokorhi/industrialchem/inorganic/PHOSPHORUS.htm)
http://www.science.uwaterloo.ca/~cchieh/cact/c123/phosphor.html (http://www.science.uwaterloo.ca/~cchieh/cact/c123/phosphor.html)