1. The logic of problem generation: From morality and solving to de-posing and rebellion;Brown;For the Learning of Mathematics,1984, February
2. A technique for assessing mathematical problem-solving ability;Collis;Journal for Research in Mathematics Education,May 1986
3. Levels of problem finding vs. problem solving;Dillon;Questioning Exchange.,1988
4. Teaching as research;Duckworth;Harvard Educational Review,1986, November