Is there complementarity or substitutability between internal and external R&D strategies?

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@article{68ef77bf6ecf42ad868f7be92a851b79,

title = "Is there complementarity or substitutability between internal and external R\&D strategies?",

author = "John Hagedoorn and Ning Wang",

year = "2012",

month = jul,

doi = "10.1016/j.respol.2012.02.012",

language = "English",

volume = "41",

pages = "1072--1083",

journal = "Research Policy",

issn = "0048-7333",

publisher = "Elsevier B.V.",

number = "6",

}