@inproceedings{c7c9930060cc4745b6910fd233fd491d,

title = "Reversible reasoning in ratio situations: Problem conceptualization, strategies and constraints",

keywords = "Reversible reasoning ratio",

author = "Ajay RAMFUL and John Olive",

year = "2009",

language = "English",

isbn = "9789602436561",

volume = "4",

pages = "449--456",

editor = "M Tzekaki and M Kaldrimidou and H Sakonidis",

booktitle = "33rd Conference of the International Group for the Psychology of Mathematics Education",

publisher = "International Group for the Psychology of Mathematics Education",

note = "In Search for Theories in Mathematics Education ; Conference date: 19-07-2009 Through 24-07-2009",

}