39-48
61-72
53-61
12-23
43-58
17-31
05-19
126-130
111-129
62-74
43-51
91-98
84-85
38-52
a study on subjective theories
67-82
93-110
110-121
139-165
85-99
15-26
12-34
5-8
38-57
5-6
101-108