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2. On the flocks of Q+(3,q);Bader;Geom. Dedicata,1989
3. Derivation of flocks of quadratic cones;Bader;Forum Math.,1990
4. A nonlinear flock in the minkowski plane of order 11;Baker;Congr. Numer.,1987
5. Un’ estensione del teorema di Segre–Kustaanheimo;Barlotti;Boll. Un. Mat. Ital.,1955