| Title | Journal | Journal Categories | Citations | Publication Date |
|---|---|---|---|---|
| Volunteered geographic information: The nature and motivation of producers | 2009 | |||
| Citizens as voluntary sensors: Spatial data infrastructure in the World of Web 2.0 | 2007 | |||
| 10.54419/qyq32i | 2006 | |||
| 10.54419/qyq32i | 2007 | |||
| 10.54419/qyq32i | 1995 |