DINÂMIA'CET, Dezembro de 2009.This paper addresses the spatial dimension of knowledge sourcing strategies, investigating the role played by social networks on the access to scientific and technological knowledge by new
biotechnology firms. Our approach takes into consideration the impact of various forms of
proximity - geographical, social, cognitive and organisational - on the development of key relationships, as well as on their use for knowledge acquisition. It enables us to assess the
relative importance of local and distant knowledge sources and to explain the entrepreneurs’ decisions in terms of network mobilisation.FC
