Revised Corporation Code
Section 102. Amendment of Articles of Incorporation. - Any amendment to the articles of incorporation which seeks to delete or remove any provision required by this Title or to reduce a quorum or voting requirement stated in said articles of incorporation shall require affirmative vote of at least two-thirds (2/3) of the outstanding capital, whether with or without voting rights, or of such greater proportion of shares as may be specifically provided in the articles of incorporation for amending, deleting or removing any of the aforesaid provisions, at a meeting duly called for this purpose.