“…Collateral (guarantees) required for the CE [18,67,69,73,81] Costs of the external funds for the CE [18,65,71,74,76,[82][83][84] "Availability" of financial resources for the CE Capital availability as a restriction [31,37] Uncertainty about the cash flows derived from investments in the CE [42,83] Source of financial resources for the CE Studies on barriers and incentives for the CE are also included since they consider financial resources, even in terms other than those covered by our study.…”