72. Members of the Coordinating Committee or the Coordinating Committee itself may call upon other persons for expert advice or assistance. The remuneration of such persons and the warrantable expenses made by them shall be paid by the Coordinating Committee only if their services have been requested by that Committee. In other cases, the remuneration of such persons and the reimbursement of the warrantable expenses made by them shall be paid by the authority having appointed the members who called upon such persons for their services.