I use VIAF regularly. If you do a keyword search for notes with “VIAF” in the authority file in OCLC Connexion, you can find lots of examples，such as:
670 DNB in VIAF, viewed Mar. 22, 2016: ǂb hdg. (Aaken, Dominik van, 1976- ; Dr. oec. publ.; b. June 1, 1976 in Kevelaer; economist)
670 German National Library in VIAF, 16 November 2015 ǂb (access point: Bielski, Zusja, 1912-1995)
670 VIAF, October 23, 2016 ǂb (National Library of Spain authorized access point: Ancira, Selma, 1956- ; variant: Ancira Berny, Selma, 1956- ; born México)
670 VIAF, September 29, 2017 ǂb (German National Library authorized access point: Bergmann, Christoph, 1979- ; place of birth: Siegen)
670 VIAF, February 7, 2018 ǂb (National Library of France authorized access point: Dalzeto, Sebastianu (1875-1963); country: France; language: Corsican; gender: Male; born 1875, Bastia; died 1963, Barchetta; poet and novelist; variants: Dalzeto, Sébastien (1875-1963), pseudonym; Nicolaï, Sébastien (1875-1963), pseudonym)
670 VIAF, November 24, 2015 ǂb (NUKAT and German National Library authorized access point: Dickinson, Thomas Herbert 1877-1961; National Library of Australia authorized access point: Dickinson, Thomas H. (Thomas Herbert), 1877- )
University of Washington Libraries
Dear NACO brains:
Two questions about sources for NARs:
1) is it ok to refer to VIAF in a 670?
2) what do people think about whether we can use the Google knowledge graph that sometimes appears at the top of a Google search?
Acquisitions & Discovery Enhancement