Author/Authors :
Kanyinda، J. P. Mukeba نويسنده Department of Mathematics and Computer Science, Higher Institute of Education of Mbuji-Mayi (ISP MBUJI-MAYI); D.R. Congo , , Matendo، R. Mabela Makengo نويسنده Department of Mathematics and Computer Science, University of Kinshasa; D.R. Congo , , Lukata، B. Ulungu Ekunda نويسنده Higher Institute of Applied Techniques of Kinshasa (ISTA-KINSHASA); D.R. Congo ,
