TY - JOUR AU - Farkas, J. PY - 1994/01/01 Y2 - 2024/03/28 TI - INTRODUCTION JF - Periodica Polytechnica Social and Management Sciences JA - Period. Polytech. Soc. Man. Sci. VL - 2 IS - 2 SE - DO - N/A UR - https://pp.bme.hu/so/article/view/6547 SP - 69-70 AB - ER -