1. Douglas E. Cameron, The birth of Soviet topology,Topology Proceedings 7 (1982), 329–378.
2. S. S. Demidov, From the early history of the Moscow school of function theory,Istoriko-Matematicheskiye Issle- dovaniya 30 (1986), 124–129 (Russian). This volume of the journal contains several articles on the role of P. A. Florensky in the early history of the Moscow school. An English translation has appeared inPhilosophia Mathematica 3 (1988), 29-35.
3. S. S. Demidov, The Moscow school of the theory of functions in the 1930’s, preprint of a talk given at the meeting of the American Mathematical Society in Louisville KY, January 1990.
4. S. S. Demidov, phone conversation with the author, late May 1988.
5. S. S. Demidov, in a conversation with the author, August 1989, identified the hospital as belonging to theInstitut usovershenstvovaniya vrachei, an institute for retraining doctors who had worked for long periods in small towns.