| Sat, 19 Feb 2011 12:01:16 +0000 | urbanc | updated second direction | file | diff | annotate |
| Sat, 19 Feb 2011 10:23:51 +0000 | urbanc | included comments by Chunhan | file | diff | annotate |
| Fri, 18 Feb 2011 15:06:06 +0000 | urbanc | added comment from Larry | file | diff | annotate |
| Fri, 18 Feb 2011 14:26:23 +0000 | urbanc | updated bib | file | diff | annotate |
| Fri, 18 Feb 2011 12:14:07 +0000 | urbanc | polished everything | file | diff | annotate |
| Thu, 17 Feb 2011 21:30:26 +0000 | urbanc | more on the conclusion | file | diff | annotate |