1. FRIČ, R.: A note on Frechet spaces Comment. Math. Univ. Carolin. 13 (1972), 411–418.
2. FRIČ, R.: Sequential envelope and subspaces of the Čech-Stone compactification In: General Topology and its Relations to Modern Analysis and Algebra, III (Proc. Third Prague Topological Sympos., 1971), Academia, Prague, 1972, pp. 123–126.
3. FRIČ, R.: Further note on Frechet spaces Comment. Math. Univ. Carolin. 14 (1973), 661–667.
4. FRIČ, R.: On the sequential uniform structures of A. Goetz In: Proc. Internat. Sympos. Topology Appl. (Budva, 1972), Savez Drustava Mat. Fiz. i Astronom., Belgrade, 1973, pp. 90–93.
5. FRIČ, R.: On the completion of sequential structures In: Proc. Internat. Sympos. Topology Appl. (Budva, 1972), Savez Drustava Mat. Fiz. i Astronom., Belgrade, 1973, pp. 94–96.