Inostrannye kapitaly v narodnom khoz︠i︡aĭstve dovoennoĭ Rossii - Olʹ, P. V. (Pavel Vasilʹevich) (Materialy dl︠i︡a izucheni︠i︡a estestvennykh proizvoditelʹnykh sil SSSR / izdavaemye Komissieĭ pri Vseso︠i︡uznoĭ akademii nauk, 1925)