Dimitrov, U., Hristova, M., Nicolescu, L., Biggins, M., Steenstrup, H., Madsen, J., Nicolescu, O., Nielsen, E., Pasheva, P., Antonova, D., Bucoi, A., Andersen, P., Димов, К., Rusinova, I., Dobrot, G., Kelly, P., Penchev, V., Tomov, B., Jacobsen, N. Twenty] 20 case studies : Intercase - Management of change,
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