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- Language: English
- Year: 1984

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- Language: Spanish
- Year: 2016

- Author: Hal R. Varian
- Language: Spanish
- Year: 2011

- Author: Hal R. VArian
- Language: English
- Year: 2014

- Author: Hal.R.Varian
- Language: English

- Author: Hal R. Varian
- Language: English
- Year: 2014

- Author: Hal R. Varian
- Language: Spanish

- Author: Hal R. Varian, Theodore C. Bergstrom
- Language: Spanish
- Year: 2011

- Author: Hal R. Varian
- Language: Spanish
- Year: 1997

- Author: Hal R. Varian
- Language: Spanish
- Year: 2007