Section 13203 - Initiation of proceedings(a) The city council of any city of the first class by a two-thirds vote of its elected members may, or upon petition presented to the city council and if filed as hereinafter provided in the form prescribed by the city council signed by not less than twenty thousand registered electors of the city shall, without undue delay, provide, by ordinance, for the appointment of a commission to frame charter provisions and for giving public notice of the passage of said ordinance. Each elector signing such petition shall add to his signature his occupation and residence and the date of signing. Signatures to the said petition may be on separate sheets but each sheet shall have appended to it the affidavit of some person not necessarily a signer and not necessarily the same person as on other sheets that to the best of affiant's knowledge and belief, the signers are registered electors of the city, that they signed with full knowledge of the contents of the petition and that their residences are correctly given.(b) The clerk of the city council of the city shall file with the mayor of the city, the secretary of the school district, the secretary of the board of judges of the court or courts of common pleas located in such city and the Secretary of the Commonwealth a copy of such ordinance, certified by him, within the five days next following its final passage, and shall also cause the public notice to be given as provided in the said ordinance.1963, Aug. 9, P.L. 643, art. II, § 3.