- Author: Alon Noga, Spencer Joel H
- Language: English
- Year: 2011
- Author: Spencer Joel H., Erdős Paul
- Language: English
- Year: 1974
- Author: Spencer Joel H., Erdős Paul
- Language: English
- Year: 1974
- Author: Spencer Joel H., Alon Noga
- Language: English
- Year: 2008