1. (a) and Factor Analysis in Chemistry, pp. 142-155, Wiley, New York (1980).
2. (b) and Factor Analysis in Chemistry, pp. 156-157, Wiley, New York (1980).
3. (c) and Factor Analysis in Chemistry, pp. 36-46, Wiley, New York (1980).
4. (d) and Factor Analysis in Chemistry, pp. 50-52, Wiley, New York (1980).
5. Determining the number of interacting species: Significant factor analysis