| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | there be reference to [art] | 6 |
|
| 2 | there [am/are] reference to [art] | 5 |
|
| 3 | there [be] references to [art] | 5 |
|
| 4 | there are reference to [art] | 5 |
|
