column
![](/style/images/custom/toleft.png)
![](/style/images/custom/toright.png)
1980, 1(2): 141-150.
1980, 1(2): 157-162.
1980, 1(2): 163-170.
1980, 1(2): 179-196.
1980, 1(2): 233-242.