Librería Samer Atenea
Kálamo Books
Librería Elías (Asturias)
Librería Kolima (Madrid)
Librería Proteo (Málaga)
'Some Famous Problems of the Theory of Numbers and in particular Waring's Problem' was a lecture delivered at the University of Oxford in 1920 by G.H. Hardy, M.A., F.R.S.