th 57. Marckx v Belgium (6833/74) [1979] ECHR 2 (13 June 1979) 58. Proposed Amendments to the Naturalisation Provisions of the Constitution of Costa Rica, Advisory Opinion th Oc-4/84, January 19 , 1984, Inter-Am. Ct. H.R. (Ser. A) No. 4 (1984) para 57 59. General Comment No. 18, Non-Discrimination CCPR (1989) para 13 . 60. Amnesty International v Zambia, para 52. 61. Re[n]contre Africaine pour la Defense des Droits de l’Homme v Zambia, paras 21 & 22. 62. See the 1969 Vienna Convention on the Law of Treaties. 63. Ibid. 64. Ibid. 65. Communications 137/94, 139/94, 154/96 & 161/97 - International Pen and Others v Nigeria (1998) para 116. 66. Legal Resource Foundation v Zambia, para 70. 67. Bangalore Principles on the Domestic Application of International Human Rights Norms, Judicial Colloquium th th held from 24 – 26 February 1988, Bangalore, India, Principle 7. 68. Sara H. Longwe v International Hotels (Zambia) 1993 4LRC 221 69. Art 27 of Vienna Convention on the Law of Treaties 70. Legal Resources Foundation v Zambia, para 60 71. [[Article 1 147/95-149/96 #46, Jawara v The Gambia, para 46.