. . . "20.1 Any notice or other communication required to be given or served under the Agreement shall be duly given or served if it is (i) in writing (for the purposes of this Section 20, a notice shall be deemed to be in writing if it is in the form of a printed or hand-written letter or other document, or in the form of a facsimile or e-mail message); (ii) signed by an authorized officer of the Party" .