Our work represents almost 35 years of original, in-depth research and

publications, children's mathematical graphics, related graphics (drawing, maps or writing), or photographs, or to reference our work

• in any publication;
• on any taught course, seminar or presentation or
• on any website or elsewhere;

unless our research, children's examples and publications are properly acknowledged, and includes both our names.

     With the exception of personal use, all other reproduction is prohibited without permission from the authors, Dr. E. Carruthers and Dr. M. Worthington or their publishers.

Thank you!