1. THE STRAIN ENERGY IN LOOSENING THE CLAMPED END OF A BEAM (PART I). Authors: PATRIC-TIMOTEI STAN, ZENO-IOSIF PRAISACH, GILBERT-RAINER GILLICH, TIBERIU MĂNESCU, CRISTIAN TUFIȘI.2. DYNAMIC BEHAVIOR OF A CLAMPED CIRCULAR PLATE AND STRAIN ENERGY REPRESENTATION (PART I). Authors: LUCIAN-NESTOR MANU, ZENO-IOSIF PRAISACH, GILBERT-RAINER GILLICH, CRISTIAN TUFIȘI.3. DYNAMIC BEHAVIOR OF A CLAMPED CIRCULAR PLATE AND STRAIN ENERGY REPRESENTATION (PART II). Authors: IONELA HAREA, ZENO-IOSIF PRAISACH, GILBERT-RAINER GILLICH, CRISTIAN TUFIȘI.