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2. [2] K. R. Popper: The Logic of Scientific Discovery, Harper and Row (1962).
3. [3] T. S. Kuhn: The Structure of Scientific Revolutions, University of Chicago Press (1962).
4. [4] M. Polanyi: The Tacit Dimension (1966).
5. [5] H. Yoshikawa: Ippan sekkei gaku (Introduction to general design), Seimitsu Kikai, 45, 22-26 (1979) (in Japanese).