Geodesic
Symmetries of special 2-flags
Journal of Singularities, Tome 21 (2020), pp. 187-204

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Derived are recursive relations describing for the first time all infinitesimal symmetries of special 2-flags (sometimes also misleadingly called `Goursat 2-flags'). When algorithmized to the software level, they will give an answer filling in the gap in knowledge as of 2010: on one side the local finite classification of special 2-flags known in lengths not exceeding four, on the other side the existence of a continuous numerical modulus of that classification in length seven. 
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     author = {Piotr Mormul and Fernand Pelletier},
     title = {Symmetries of special 2-flags},
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Piotr Mormul; Fernand Pelletier. Symmetries of special 2-flags. Journal of Singularities, Tome 21 (2020), pp. 187-204. doi: 10.5427/jsing.2020.21k

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