Ross Tate. Mixed-Site Variance. FOOL '13: Informal Proceedings of the 20th International Workshop on Foundations of Object-Oriented Languages. 2013 [2014-01-24]. (原始内容存档于2014-02-01).
Tate, Ross; Leung, Alan; Lerner, Sorin. Taming wildcards in Java's type system. Proceedings of the 32nd ACM SIGPLAN conference on Programming language design and implementation (PLDI '11). 2011 [2014-01-24]. (原始内容存档于2014-02-09).
Luca Cardelli. A semantics of multiple inheritance(PDF). Semantics of Data Types (International Symposium Sophia-Antipolis, France, June 27 – 29, 1984). Lecture Notes in Computer Science 173. Springer. 1984 [2014-01-24]. doi:10.1007/3-540-13346-1_2. (原始内容存档(PDF)于2014-02-01).(Longer version in Information and Computation, 76(2/3): 138-164, February 1988.)
Section II.9.7 in ECMA International Standard ECMA-335 Common Language Infrastructure (CLI) 6th edition (June 2012); available online (页面存档备份,存于互联网档案馆)
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Bertrand Meyer. Static Typing(PDF). OOPSLA 95 (Object-Oriented Programming, Systems, Languages and Applications), Atlanta, 1995.. October 1995 [2014-01-24]. (原始内容存档(PDF)于2012-11-14).
Atsushi Igarashi; Mirko Viroli. On Variance-Based Subtyping for Parametric Types(PDF). Proceedings of the 16th European Conference on Object-Oriented Programming (ECOOP '02). 2002 [2014-01-24]. (原始内容(PDF)存档于2006-06-22).
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Martin Odersky; Matthias Zenger. Scalable component abstractions(PDF). Proceedings of the 20th annual ACM SIGPLAN conference on Object-oriented programming, systems, languages, and applications (OOPSLA '05). 2005 [2014-01-24]. (原始内容存档(PDF)于2013-01-24).
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Luca Cardelli. A semantics of multiple inheritance(PDF). Semantics of Data Types (International Symposium Sophia-Antipolis, France, June 27 – 29, 1984). Lecture Notes in Computer Science 173. Springer. 1984 [2014-01-24]. doi:10.1007/3-540-13346-1_2. (原始内容存档(PDF)于2014-02-01).(Longer version in Information and Computation, 76(2/3): 138-164, February 1988.)
Luca Cardelli. A semantics of multiple inheritance(PDF). Semantics of Data Types (International Symposium Sophia-Antipolis, France, June 27 – 29, 1984). Lecture Notes in Computer Science 173. Springer. 1984 [2014-01-24]. doi:10.1007/3-540-13346-1_2. (原始内容存档(PDF)于2014-02-01).(Longer version in Information and Computation, 76(2/3): 138-164, February 1988.)
Section II.9.7 in ECMA International Standard ECMA-335 Common Language Infrastructure (CLI) 6th edition (June 2012); available online (页面存档备份,存于互联网档案馆)
Ross Tate. Mixed-Site Variance. FOOL '13: Informal Proceedings of the 20th International Workshop on Foundations of Object-Oriented Languages. 2013 [2014-01-24]. (原始内容存档于2014-02-01).
Atsushi Igarashi; Mirko Viroli. On Variance-Based Subtyping for Parametric Types(PDF). Proceedings of the 16th European Conference on Object-Oriented Programming (ECOOP '02). 2002 [2014-01-24]. (原始内容(PDF)存档于2006-06-22).
Tate, Ross; Leung, Alan; Lerner, Sorin. Taming wildcards in Java's type system. Proceedings of the 32nd ACM SIGPLAN conference on Programming language design and implementation (PLDI '11). 2011 [2014-01-24]. (原始内容存档于2014-02-09).