EXHIBIT A
JOINT FILING AGREEMENT
PURSUANT TO RULE 13d-1(k)1
The undersigned acknowledge and agree that the foregoing statement of
Schedule 13D is filed on behalf of each of the undersigned and that all
amendments to this statement on Schedule 13D shall be filed on behalf of each of
the undersigned without the necessity of filing additional joint acquisition
statements. The undersigned acknowledge that each shall be responsible for the
timely filing of such amendments, and for the completeness and accuracy of the
information concerning him or it contained therein, but shall not be responsible
for the completeness and accuracy of the information concerning the other,
except to the extent that he or it knows or has reason to believe that such
information is inaccurate.
Date: April 2, 1999
WARBURG, XXXXXX VENTURES, L.P.
By: Warburg, Xxxxxx & Co., General Partner
By: /s/ Xxxxxxx Xxxxxxx
------------------------------
Name: Xxxxxxx Xxxxxxx
Title: Partner
WARBURG, XXXXXX & CO.
By: /s/ Xxxxxxx Xxxxxxx
------------------------------
Name: Xxxxxxx Xxxxxxx
Title: Partner
X. X. XXXXXXX, XXXXXX & CO., LLC
By: /s/ Xxxxxxx Xxxxxxx
------------------------------
Name: Xxxxxxx Xxxxxxx
Title: Member
/s/ Xxxxxx X. Xxxxxxx
------------------------------
Xxxxxx X. Xxxxxxx
/s/ Xxxx X. Xxxxx
------------------------------
Xxxx X. Xxxxx
/s/ Xxxxxx X. Xxxxx
------------------------------
Xxxxxx X. Xxxxx
/s/ Xxxxxxxx X. Xxxxxxx
------------------------------
Xxxxxxxx X. Xxxxxxx
/s/ Xxxxxxx X. Xxxxxx
------------------------------
Xxxxxxx X. Xxxxxx
/s/ Xxxx X. Xxxxxxxxx
------------------------------
Xxxx X. Xxxxxxxxx
/s/ Xxxxxxx X. Xxxxxxxxx
------------------------------
Xxxxxxx X. Xxxxxxxxx
/s/ Xxxxxxx X. Xxxxxxxx
------------------------------
Xxxxxxx X. Xxxxxxxx
/s/ Xxxxx X. XxXxxx
------------------------------
Xxxxx X. XxXxxx
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