The text of such petition and a notice stating the time of the meeting at which the same will be presented shall be published in the district pursuant to Section 6066 of the Government Code. When contained upon more than one instrument, one copy only of such petition need be published. No more than five of the names attached to the petition need appear in such publication of the petition and notice, but the number of signers shall be stated. Publication shall be complete at least seven, but not more than 28, days before the time at which the petition is to be presented to the board.