* http://books.google.com.ar/books?id=exSs8m6hoGIC&pg=PA148&lpg=PA148&dq=filosofo+Harald+Hoeffding&source=bl&ots=7nn9F01K1x&sig=wlbv14HJ7k5gCchqppvSTtFREH0&hl=es&sa=X&ei=5MPZUveDCNPNkQfZ9oGICQ&ved=0CEcQ6AEwAw#v=onepage&q=filosofo%20Harald%20Hoeffding&f=false