P. Helle

Return on relationships: conceptual understanding and measurement of mutual gains from relational business engagements

C. Grönroos, P. Helle, 2012 .

Adopting a service logic in manufacturing: Conceptual foundation and metrics for mutual value creation

Christian Grönroos, C. Grönroos, P. Helle, 2010 .

“ Re-Conceptualizing Value-Creation ”

P. Helle, 2010 .