American Mathematical Monthly
Volume 68; Issue 710
|
|
19
|
|
20
|
|
32
|
|
37
|
|
38
|
|
42
|
|
46
|
|
48
|
|
50
|
|
55
|
|
59
|
|
62
|
|
64
|
|
68
|
|
69
|
|
91
|
|