When did Aleksandr Lyapunov publish his doctoral thesis on the general problem of the stability of motion?
SELECT ?value1 ?value2 WHERE { wd:Q310788 p:P1026 ?s . ?s ps:P1026 wd:Q55312168 . ?s pq:P577 ?value1 . ?s pq:P184 ?value2 }
aleksandr lyapunov: Q310788 the general problem of the stability of motion: Q55312168