?url_ver=Z39.88-2004&rft_id=10.1109%2FIC3e.2017.8409253&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.aulast=Halim&rft.au=Halim%2C+F.A.A.&rft.aufirst=F.A.A.&rft.title=Towards+a+mobile+app+design+model+for+Dyscalculia+children&rft.isbn=9781538631454&rft.date=2018&rft.genre=proceeding