Article 26 Each Central Authority shall bear its own costs in applying this Convention. Central Authorities and other public services of Contracting States shall not impose any charges in relation to applications submitted under this Convention. In particular, they may not require any payment from the applicant towards the costs and expenses of the proceedings or, where applicable, those arising from the participation of legal counsel or advisers. However, they may require the payment of the expenses incurred or to be incurred in implementing the return of the child. However, a Contracting State may, by making a reservation in accordance with Article 42, declare that it shall not be bound to assume any costs referred to in the preceding paragraph resulting from the participation of legal counsel or advisers or from court proceedings, except insofar as those costs may be covered by its system of legal aid and advice. Upon ordering the return of a child or issuing an order concerning rights of access under this Convention, the judicial or administrative authorities may, where appropriate, direct the person who removed or retained the child, or who prevented the exercise of rights of access, to pay necessary expenses incurred by or on behalf of the applicant, including travel expenses, any costs incurred or payments made for locating the child, the costs of legal representation of the applicant, and those of returning the child. Article 27 When it is manifest that the requirements of this Convention are not fulfilled or that the application is otherwise not well founded, a Central Authority is not bound to accept the application. In that case, the Central Authority shall forthwith inform the applicant or the Central Authority through which the application was submitted, as the case may be, of its reasons. Article 28 A Central Authority may require that the application be accompanied by a written authorisation empowering it to act on behalf of the applicant, or to designate a representative so to act. Article 29 This Convention shall not preclude any person, institution or body who claims that there has been a breach of custody or access rights within the meaning of Article 3 or 21 from applying directly to the judicial or administrative authorities of a Contracting State, whether or not under the provisions of this Convention. Article 30 Any application submitted to the Central Authorities or directly to the judicial or administrative authorities of a Contracting State in accordance with the terms of this Convention, together with documents and any other information appended thereto or provided by a Central Authority, shall be admissible in the courts or administrative authorities of the Contracting States. Article 31 In relation to a State which in matters of custody of children has two or more systems of law applicable in different territorial units – a) any reference to habitual residence in that State shall be construed as referring to habitual residence in a territorial unit of that State; b) any reference to the law of the State of habitual residence shall be construed as referring to the law of the territorial unit in that State where the child habitually resides.