Collected problems About inequality Nguyễn Phi Hùng Phan Hồng Sơn - Võ Thành

LINK GOOGLE BOOK DEMO
https://books.google.com.br/books?id=zSNjDAAAQBAJ&lpg=PA93&ots=4U_xDzNOnl&dq=NGUYEN%20VAN%20thach%20collected%20problems%20about%20inequality&hl=pt-BR&pg=PA2#v=onepage&q&f=false

LINK ALTERNATIVO
http://pt.slideshare.net/ria_nghia/6856978-collectedproblemsaboutinequality