I'm looking for the following paper:

Marlow, S. and Powell, M.J.D.
A FORTRAN subroutine for plotting the part of a conic that is inside a given
triangle. Rep. R-8336, Atomic Energy Res. Establishment, Harwell, England
1976

Or anything related (including 3D cases)
 Max
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Max Froumentin                    |
Laboratoire d'Informatique        |  "Always better, never first."         
Fondamentale de Lille             |         - Tigran Petrossian
France                            |