Table 2.

Articles included in the literature review

	Quantitative	Qualitative/Literature Reviews	Mixed Methods
Analyses of economies of scale only	Adams & Griliches [39], Bauer et al. [34], Bonaccorsi & Daraio [68], Bonaccorsi & Daraio [38], Bordons & Zulueta [69], Bordons et al. [70], Cohen [71], Cohen [72], Gomes et al. [73], Heale et al. [35], Hoare [43], Johnes & Johnes [74], Kenna & Berche [33], Kenna & Berche [44], King [50], Kretschmer [32], Mamun [75], Nag et al. [76], Rey-Rocha et al. [77], Sav [36], Schubert [22], Stankiewicz [78]	Cohen [79], Heinze et al. [80], Johnston [81], Rhoten [40], Stokols et al. [82] von Tunzelmann et al. [85] (This is a pure theoretical analysis)	Adams et al. [83], Carayol & Matt [84] Lowry et al. [86]
Analyses of economies of scope only	Cherchye et al. [54], Glass et al. [55]
Analyses of both economies of scale and economies of scope	Agasisti & Johnes [14], Chavas et al. [21], Cohn et al. [46], de Groot et al. [48], Dundar & Lewis [52], Foltz et al. [41], Glass et al. [45], Hinze et al. [53], Johnes & Johnes [15], Johnes & Salas-Velasco [87], Johnes & Schwarzenberger [16], Laband & Lentz [47], Mamun [19], Olivares & Wetzel [51], Olson [88], Sav [37], Seglen & Aksnes [89], Spanos & Vonortas [31], Wolszczak-Derlacz & Parteka [49]		Vonortas et al. [90]
Analyses of topics closely related to economies of scale or scope (e.g. co-location)	Abramovsky et al. [91] (effect of co-location, R&D labs and university)	Atkinson et al. [92] (change in scientific collaboration along time)	Beise & Stahl [93] (effect of co-location (private and public))
	Antonio-García et al. [94] (analysed the effect of size through the satisfaction with resources)	Bos et al. [95] (co-location of the team members)
		Chin-Tsai & Chang-Tzu [96] (how research performance can be assessed)
		Coen et al. [97] (integrating the tangible and intangible structures that underlie research centre functioning (co-location))

Source: Authors’ elaboration