References.
- Arkin H., Colton R. R. Graphs, how to make and use them. New York and London 1936
- Davis D. S. Empirical equations and nomography. New York and London 1943
- Ericsson Y. Enamel-Apatite Solubility. Investigation into the Calcium Phosphate Equilibrium between Enamel and Saliva and its Relation to Dental Caries. Acta Odont. Scand. 1949; 8, suppl. 3
- Giljam E. Lärobok i nomografi. Stockholm 1943