References

  • Dr. Afaf Ghais Abadi Ahmed, Head of Dept. of Engineering Mathematics, Faculty of Engineering, University of Khartoum,
  • Tel. 0122741047.
  • Dr. Osman Mohamed El Mekky, Dept. of Applied Mathematics, Faculty of Mathematical Sciences, University of Khartoum,
  • Tel 0912263743.
  • Dr. Mohamed Abd Almonem Ismail, Dean of College of Sciences and Arts, Nizwa University, Oman.ismail@unizwa.edu.om.