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Annotated Bibliography of Annona. (1990-2004). Crops for the Future. Retrieved from https://books.google.com.my/books?id=iT6fToeFeXMC&pg=PT380&lpg=PT380&dq=psidium+guajava+intercropping+maize&source=bl&ots=9O-jl7KuWO&sig=ACfU3U1XC9xK0brPYxYkfxwaJQVDrjbTJw&hl=en&sa=X&ved=2ahUKEwillaDVvrXoAhWtzjgGHYsfBxMQ6AEwBXoECAsQAQ#v=onepage&q=psidium%20guajava%20intercropping%20maize&f=false