Geodesic
Quasi-projections
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Analysis and singularities. Part 2, Tome 259 (2007), pp. 282-290.

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We classify simple singularities of projections to a plane of surfaces embedded in three-space up to a special equivalence relation which is rougher than the standard one. A relation to the simple boundary classes $B$, $C$, and $F$ is established. 
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V. M. Zakalyukin. Quasi-projections. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Analysis and singularities. Part 2, Tome 259 (2007), pp. 282-290. http://geodesic.mathdoc.fr/item/TM_2007_259_a15/

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