American Mathematical Monthly
Volume 81; Issue 81
|
|
2
|
|
3
|
|
5
|
|
6
|
|
12
|
|
13
|
|
16
|
|
19
|
|
20
|
|
23
|
|
27
|
|
29
|
|
34
|
|
37
|
|
38
|
|
39
|
|
41
|
|
54
|
|
64
|
|
67
|
|
71
|
|