Verfahren zur Analyse saisonaler Schwankungen in ökonomischen Zeitreihen - Stier, W. W. Polasek — 1983 Metrika
Data Reduction, Analysing and Interpreting Statistical Data - Ehrenberg, A.S.C. W. Polasek — 1977 Metrika
Embedded Invariants, A Contribution to Forecasting - Sengupta, S.S.; Yeo, G.K. W. Polasek — 1980 Metrika