1. Proc. XIIth Colloque Ampere, Bordeaux, September 17 to 21, 1963, North-Holland Publ. Co., Amsterdam 1964 (pp. 466 to 471).
2. Internat. Conf. Physics of Ferroelectrics, Poznan, October 25 to 27, 1965, Abstract:, (pp. 2, 3).
3. A Model of Ferroelectrics, Polish Glycine Seminar, Poznan, December 3, 1969, unpublished.
4. , and , Temperature Dependence of the Polarization of Some Ferroelectrics Based on a Model of Structural Antiferroelectrics, 2nd Polish Glycine Seminar, Poznan. May 8, 1973, unpublished.