| Share | Phrase |
|---|
| 33.40% | patent [validity] literature |
| 16.03% | technical [domain related] literature |
| 15.74% | patent [validity] literature |
| 15.59% | literature [does] pertain |
| 6.73% | describe in literature |
| 5.21% | prior [chronology] literature |
| 5.09% | art literature |
| 2.18% | literature [does] include |