000 00327nam a2200133Ia 4500
008 240227s9999 xx 000 0 und d
041 _a Sinhala
245 0 _aසංකේතමය නිරූපණ
260 _bNIE,
_c1996
300 _a70p.;
_c28cm
650 _aMathematics
658 _aDistance Education
942 _cMD
999 _c98381
_d98381