1. Acceleration of conservation of substance;Brison;Journal of Genetic Psychology,1966
2. Relations between syntax and semanties: Are they “easy to see?”;Cambon,1973
3. A regression phenomenon in the conservation of weight;Dasen;Archives de Psychologie,1972
4. The character of physical law;Feynman,1965
5. Conservation and equilibration theory;Hall;Journal of Genetic Psychology,1968