共 15 条
[11]
RUSSEL G, 1969, GENERAL INSTRUCTIONS
[12]
SHAPIRO BK, 1979, DEV MED CHILD NEUROL, V21, P369
[13]
VONWENDT L, 1984, J MENT DEFIC RES, V28, P219
[14]
1968, OFFICIAL STATISTICS
[15]
1971, OFFICIAL STATISTICS