An alphanumeric identifier that identifies a technical report within a series sponsored by the publishing institution. For example, STAN-CS-68-118 is the 118th report number of a report written at Stanford in the computer science department in 1968.
(=> (Ref.Report-Number $X $Y) (Biblio-Name $Y)) (=> (Ref.Report-Number $X $Y) (Technical-Report-Reference $X))