Isidor Pavlovich Natanson (1906-1964)

Isidor Pavlovich Natanson at the Mathematics Genealogy Project.

Isidor Pavlovich Natanson at Wikipedia.

I. P. Natanson at MathSciNet (for those with access).

I. P. Natanson at Math-Net.ru.

I. P. Natanson's page in Russian, English at St. Petersburg University.

Kantorovich, L. V., and D. K. Faddeev, Isidor Pavlovich Natanson (on the fiftieth anniversary of his birth) (in Russian) Uspehi Mat. Nauk 11 (1956), no. 4 (70), 193-196.

Vulih, B. Z., M. K. Gavurin, and S. M. Lozinskii, Isidor Pavlovic Natanson. Obituary. (in Russian) Uspehi Mat. Nauk 20 (1965), no. 1 (121), 171-175. In English (for those with access).