Geodesic
Focal set of a surface with boundary, and caustics of groups generated by reflections $B_k$, $C_k$, and $F_4$
Funkcionalʹnyj analiz i ego priloženiâ, Tome 18 (1984) no. 1, pp. 90-91 
I. G. Shcherbak. Focal set of a surface with boundary, and caustics of groups generated by reflections $B_k$, $C_k$, and $F_4$. Funkcionalʹnyj analiz i ego priloženiâ, Tome 18 (1984) no. 1, pp. 90-91. http://geodesic.mathdoc.fr/item/FAA_1984_18_1_a23/
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     title = {Focal set of a surface with boundary, and caustics of groups generated by reflections $B_k$, $C_k$, and $F_4$},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
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}
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