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- [22] Intramural and external R&D: evidence for complementarity or substitutability Economia Politica, 2018, 35 : 555 - 577
- [29] Intermedia Substitutability and Market Demand by National Advertisers Review of Industrial Organization, 2002, 20 : 323 - 348
- [30] Demand cross elasticity without substitutability: An experiment JOURNAL OF SOCIO-ECONOMICS, 2012, 41 (02): : 255 - 265