{{cite journal |last=The Data Nerd |title=Infrastructure buildouts are even rarer: 4% of observations |journal=SSRN Electronic Journal |year=2026 |doi=10.2139/ssrn.6606558 |url=https://signals.gitdealflow.com/research/infrastructure-buildouts-rare-4-percent |publisher=VC Deal Flow Signal (GitDealFlow) |orcid=0009-0002-2222-4112 |at=§3.3 Signal classification}}