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 the affirmative vote of at least two-thirds (2/3) of the outstanding capital stock, 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 the purpose.