BIBLIOGRAPHIC
| TITLE | URL |
| MathSciNet (e-Shodh Sindhu) | http://www.ams.org/mathscinet/ |
| SciFinder Scholar (e-Shodh Sindhu) | http://www.cas.org/ |
| TITLE | URL |
| MathSciNet (e-Shodh Sindhu) | http://www.ams.org/mathscinet/ |
| SciFinder Scholar (e-Shodh Sindhu) | http://www.cas.org/ |
