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（原始内容存档于2020-12-17）. Hershkovits, David. Don Johnson in series, 2M Communications Production[s]. New York: St. Martin's Press. 1986. ISBN 0-312-90165-8
。因此NP困难问题“至少与NP完全问题一样难”。 NP (複雜度) NP完全 P/NP问题 歸約 Michael R. Garey; David S. Johnson. Computers and Intractability: A Guide to the Theory of NP-Completeness
大卫·奇尔顿·菲利浦斯
PMID 902882. L. N. Johnson. David Chilton Phillips, Lord Phillips of Ellesmere, K.B.E. 7 March 1924 — 23 February 1999: Elected F.R.S. 1967. Biographical
（页面存档备份，存于互联网档案馆） Bourdon, David (May 1970). "What's Up in Art, The Castelli Clan". 生活. Accessed June 9, 2010. （英文）Saint, Andrew. Philip Johnson — Flamboyant Postmodern
Michael (28 June 2011). Ray William Johnson: =3 Adds Up To Most-Subscribed On YouTube （页面存档备份，存于互联网档案馆）, Forbes Gasch, David (February 7, 2011). Pop!shots: