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

Ryals, L. J., & 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.

This article provides a very comprehensive review of the literature on relationship portfolios and proposes five critical elements that should be used in a relationship portfolio analysis in order to make decisions about how to manage the portfolio strategically:

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