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2. Estimation of principal components and related models by iterative least squares;Wold,1996
3. Non-linear estimation by iterative least squares procedures;Wold,1996
4. Non-linear iterative partial least squares (NIPALS) modelling: some current developments;Wold,1973
5. Soft modelling by latent variables; the nonlinear iterative partial least squares approach;Wold,1975