Brännmark, M., Langstrand, J., Johansson, S., Halvarsson, A., Abrahamsson, L. and Winkel, J. (2012) “Researching Lean: Methodological Implications of Loose Definitions”, Quality Innovation Prosperity, 16(2), pp. 35–48. doi: 10.12776/qip.v16i2.67.