Agreement between the Government of the Netherlands and the Government of the Federal Republic of Germany on the waiver of the refund, provided for in Article 14 (2) of Regulation no. 36/63 EEC (Official Journal of the European Communities, 20 April 1963. no. 62), of expenditure incurred in the provision of benefits in kind for sickness to a pensioner who is either a former frontier worker or the survivor of a frontier worker and to the members of his family