- Author: Robert M. Gray
- Language: English
- Year: 2006
- Author: Robert M. Gray (auth.)
- Language: English
- Year: 2011
- Author: Robert M. Gray (auth.)
- Language: English
- Year: 2011
- Author: Robert M. Gray
- Language: English
- Year: 2006
- Author: Robert M. Gray
- Language: English
- Year: 2005
- Author: Robert M. Gray (auth.)
- Language: English
- Year: 2011
- Author: Robert M. Gray (auth.)
- Language: English
- Year: 2009
- Author: Robert M. Gray (auth.)
- Language: English
- Year: 2009
- Author: Robert M. Gray Lee D. Davisson
- Language: English
- Year: 2010
- Author: Robert M. Gray
- Language: English
- Year: 2006