CCPR/C/79/Add.62
3 April 1996
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18. The requirement to sing the national anthem and salute the flag as a condition of attending a State school, despite conscientious objection, appears to be an unreasonable requirement and to be incompatible with articles 18 and 24 of the Covenant.
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Source: http://www.unhcr.org/refworld/type,CONCOBSERVATIONS,,ZMB,3ae6b0324,0.html