L. B. Nakhmanson, “The Lindelöf property and the tightness of a locally convex space”, Mat. Zametki, 47:6 (1990), 67–73; Math. Notes, 47:6 (1990), 573–577
1984
2.
L. B. Nakhmanson, “The Suslin number and calibres of the ring of continuous functions”, Izv. Vyssh. Uchebn. Zaved. Mat., 1984, no. 3, 49–55; Soviet Math. (Iz. VUZ), 28:3 (1984), 64–72