Question: What is the date of death of Tatyana Afanasyeva's husband?
Sentence (from "Tatyana Afanasyeva"): Tatyana Alexeyevna Afanasyeva  (Kiev, 19 November 1876 – Leiden, 14 April 1964) (also known as Tatiana Ehrenfest-Afanaseva or spelled Afanassjewa) was a Russian/Dutch mathematician and physicist who made contributions to the fields of statistical mechanics and statistical thermodynamics.
Relevant evidence: No