1. On topologies for function spaces;Fox;Bull. Amer. Math. Soc.,1945
2. General Topology;Kelley,1975
3. Differential equations with discontinuous right-hand side;Filippov;Mat. Sb. (N.S.),1960
4. Classical solutions of differential equations with multi-valued right-hand side;Filippov;SIAM J. Control,1967
5. On trajectories of orientor fields;Plis;Bull. Acad. Pol. Sci., Sér. Sci. Math. Astron. Phys.,1965