- Polikanova, I. V.; Perelʹman, G. Ya. (1986). "A
remark on ****y's theorem".
Sibirskij Matematiceskij Zurnal. 27 (5): 191–194. MR 0873724. Zbl 0615.52009....
- ISSN 1730-6264. L Reizins, E Riekstins, E K
Fogels (Russian),
Latvijskij Matematičeskij Ežegodnik, No. 30 (1986), 3-8. "Ernests
Fogels biography". www-history...
- Riekstins, "Mathematics in
University of
Latvia 1919–1969",
Latvijskij matematiceskij jezegodnik, 1975 (16), pp. 14–22 (in Russian) L. Reizins, "From the...
