- Author: Arabela Aprahamian, Georgiana Pop, Georgiana Pop
- Language: English
- Year: 2015
- Author: Peter N. Nemetz
- Language: English
- Year: 1989
- Author: David Mataen
- Language: English
- Year: 2012
- Author: Zhesong Jin, Jun Li, Jin Zhesong, Li Jun
- Language: English
- Year: 2011
- Author: Douglas Steeples, David O. Whitten
- Language: English
- Year: 2001
- Author: Massimiliano Calì, World Bank
- Language: English
- Year: 2014
- Author: Phillip I. Ackerman-Lieberman
- Language: English
- Year: 2014