1. 1. Rubin Z:. Liking and Loving: An Invitation io Social Psychology. New York Holt Rim-hart and Winston Ine 1973 p 25.
2. 2. Lindzey G. Byiiic D: Measurement of social choice and interpersonal attraction. In Gardner L Aronson E (eds): Handbook of Social Psychology. Reading Pennsylvania Addison-Wesley 1968 pp 452-525.
3. 3. Rubin: op fit pp 26-28.
4. 4. Bales RF Slater PE: Role differentiation in small decision-making groups in Parsons Talcott Bales et al (eels): Family Socialization and Interaction Processes. Glencw Illinois Free Press 1955.
5. 5. Blau P: A theory of social integration. Amer J Soc 65:545-556 1960.