https://app.knowbase.one/vault/rfc/docid/6822
RFC0626: On a possible lockup condition in IMP subnet due to message sequencing
Network Working Group L. Kleinrock (UCLA-NMC) Request for Comments: 626 H. Opderbeck (UCLA-NMC) NIC #22161 Mar 1974 "On a Possible Lockup Condition in th...