Communications under this article may be received and considered only if submitted by a State Party which has made a declaration recognizing in regard to itself the competence of the Committee. No communication shall be received by the Committee if it concerns a State Party which has not made such a declaration. Communications received under this article shall be dealt with in accordance with the following procedure: (a) If a State Party to the present Covenant considers that another State Party is not giving effect to the provisions of the present Covenant, it may, by written communication, bring the matter to the attention of that State Party. Within three months after the receipt of the communication the receiving State shall afford the State which sent the communication an explanation, or any other statement in writing clarifying the matter which should include, to the extent possible and pertinent, reference to domestic procedures and remedies taken, pending, or available in the matter; (b)  If the matter is not adjusted to the satisfaction of both States Parties concerned within six months after the receipt by the receiving State of the initial communication, either State shall have the right to refer the matter to the Committee, by notice given to the Committee and to the other State; 28