9Jinfa Cai.A Cognitive Analysis of U.S and Chinese Student's Mathematical Performance on Tasks Involving Computation,Simple Problem Solving and Complex Problem Solving [M].National Council of Teachers of Mathematics,1995.
10Silver E A,Jinfa Cai.An Analysis of Arithmetic Problem Posing by Middle School Students [J].Journal for Research in Mathematics Education,1997,27(5):521-539.
