1. American Psychiatric Association (2013) Diagnostic and statistical manual of mental disorders, 5th edn. DSM-5. American Psychiatric Association, Washington, DC
2. American Psychiatry Association (1994) Diagnostic and statistical manual of mental disorders (DSM-IV). American Psychiatric Publishing, Washington, DC
3. Baccaglini-Frank A (2015) Preventing low achievement in arithmetic through the didactical materials of the PerContare project. In: Sun X, Kaur B, Novotná J (eds) ICMI study 23 conference proceedings. University of Macau, Macau, pp 169–176
4. Baccaglini-Frank A (2017) Preventing learning difficulties in arithmetic: the approach of the PerContare project. Math Teach 258:14–18
5. Bartelet D, Ansari D, Vaessen A et al (2014) Research in developmental disabilities cognitive subtypes of mathematics learning difficulties in primary education. Res Dev Disabil 35:657–670