Exhibit A JOINT FILING UNDERTAKING
Exhibit A
The undersigned, being duly authorized thereunto, hereby execute this agreement as an exhibit to
this Schedule 13D to evidence the agreement of the below-named parties, in accordance with the
rules promulgated pursuant to the Securities Exchange Act of 1934, to file this Schedule jointly on
behalf of each such party.
Dated: March 9, 2009.
| Yorktown Avenue Capital, LLC | ||||||
| By: | /s/ Xxxxxxx X. Xxxxxx | |||||
| /s/ Xxxxxxx X. Xxxxxx | ||||||
| Xxxxxxx X. Xxxxxx | ||||||
| /s/ Xxxxx X. Xxxxxxx | ||||||
| Xxxxx X. Xxxxxxx | ||||||
