References
- Kumar , M. and Maul , G. A. , eds. 1991 . Marine Positioning into the 1990's. , Washington, DC : Marine Technology Society .
- Maul , G. A. and Mooers , C. N. K. 1990 . Report on INSMAP'90: The Second International Symposium on Marine Positioning . Mar. Geod. , 14 ( 3–4 ) : 169 – 175 .