Corsaro, D., Flocca, R., Henneberg, S.C. and Tunisini, A. (2013) ‘A value perspective on relationship portfolios’, Marketing Theory, 13(3): 275–302.

This article provides a very comprehensive review of the literature on relationship portfolios and proposes five critical elements that should be used in relationship portfolio analysis to guide strategic relationship decisions.

Ryals, L.J. and Humphries, A.S. (2007), ‘Managing key business-to-business relationships: what marketing can learn from supply chain management’,  Journal of Service Research, 9(4): 312-326.

It is acknowledged that approaches to relationship management are more developed in procurement/supply chain management than marketing. This article provides a useful point from which discussion of KAM can be considered.