1. Estimation of principal components and related models by iterative least squares;Wold,1966
2. Path models with latent variables: the NIPALS approach;Wold,1975
3. The Fix-Point Approach to Interdependent Systems,1981
4. Soft modeling: the basic design and some extensions;Wold,1982
5. Four levels of pattern recognition;Albano;Anal. Chim. Acta Comput. Tech. Optim.,1978