Pirnay, Fabrice; Surlemont, Bernard; Nlemvo, Frederic - In: Small Business Economics 21 (2003) 4, pp. 355-69
This paper discusses existing definitions of USOs in order to reconcile them and to provide criteria for classifying and understanding the different facets of this multi-headed concept. Drawing the boundaries of this concept and elucidating its variety through a typology are therefore the two...