21. Pneumonia in Boston during the recent epidemic of influenza Author(s): Shattuck, George B. (George Brune), author Publication: Boston : Damrell & Upham, 1892 Subject(s): Influenza, Human -- epidemiologyEpidemicsPneumonia -- epidemiologyBoston
22. Otchet o grippoznoĭ ėpidemīi v russkoĭ armīi v 1889 i 1890 g Author(s): Verekundov, S. P. (Semen Pavlovich), 1860-1903 Publication: S.-Peterburg : "Vladimīrskai︠a︡" Tipo-lit. L. Mordukhovskoĭ, 1891 Subject(s): Influenza, Human -- epidemiologyEpidemicsMilitary PersonnelRussia (Pre-1917) -- epidemiologyRussia. Armii︠a︡.