Aas, Tor Helge; Breunig, Karl Joachim; Hydle, Katja (2017). “Exploring new service portfolio management”. 《International Journal of Innovation Management》 21 (6). doi:10.1142/S136391961750044X. hdl:10642/5061.
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Aas, Tor Helge; Breunig, Karl Joachim; Hydle, Katja (2017). “Exploring new service portfolio management”. 《International Journal of Innovation Management》 21 (6). doi:10.1142/S136391961750044X. hdl:10642/5061.