Roussilhe oblique stereographic projection
The Roussilhe oblique stereographic projection is a mapping projection developed by Henri Roussilhe in 1922. The projection uses a truncated series to approximate an oblique stereographic projection for the ellipsoid. The projection received some attention in the former Soviet Union.
The development of the Bulgarian oblique stereographic projection was done for Romania by the Bulgarian geodesist, Hristow, in the late 1930s.
- Snyder, John P. (1993). Flattening the Earth: Two Thousand Years of Map Projections p. 169. Chicago and London: The University of Chicago Press. ISBN 0-226-76746-9.
-  libproj4 cartographic projection library with Roussilhe oblique stereographic projection support
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