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- TRYFOS, Peter. Methods for business analysis and forecasting : text and cases. New York : John Wiley & Sons, Inc., 1998. 576 s. ISBN 0-471-12384-6. [Copy count : 1, currently available 0, at library only 1]
book
- TRYFOS, Peter. Sampling methods for applied research : text and cases. New York : John Wiley & Sons, Inc., 1996. 440 s. ISBN 0-471-04727-9. [Copy count : 1, currently available 1, at library only 0]
book