Contract
EXHIBIT
99.4
The undersigned, Power Technology
Investment Corporation and Power Corporation of Canada, hereby agree and
acknowledge that the information required by this Schedule 13G, to which this
Agreement is attached as an exhibit, is filed on behalf of each of
them.
Dated: February
17, 2009
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By:
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/s/ XXXXX XXXXX | |
| Name: Xxxxx Xxxxx | |||
| Title: President | |||
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POWER
CORPORATION OF CANADA
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By:
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/s/ XXXXXXXX XXXXX | |
| Name: Xxxxxxxx Xxxxx | |||
| Title: Vice President and Assistant General Counsel | |||
