ferrand, A., Marquet, J., & Van Campenhoudt, L. (1998). “Social network and normative context”. In HUBERT M., BAJOS N., SANDFORT T., Eds,1998 (ed.), Sexual Behaviour and HIV/AIDS in Europe. Comparisons of national surveys (p. p. 303-327). University College London Press, Social Aspects of Aids Series. https://hdl.handle.net/2078.5/89974