To obtain an order of the district court for the sale of oil, gas, or other mineral rights, a verified petition must be presented to and filed with the court setting forth the matters required by law to be contained in a petition for the sale of real estate and in addition thereto setting forth the quantity of the interest in the oil, gas, or other minerals desired to be sold and the probable amount to be realized on the sale thereof. A citation must be issued on the petition and served in the manner provided by law for the service of citations in district court. If all persons interested in the estate join in the petition or signify in writing their assent thereto or waive service of notice thereof, the hearing may be had at any time.