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Brian Davies. Integral Transforms and Their Applications. https://books.google.co.uk/books?id=FViAkJi9c7EC&printsec=frontcover&dq=davies+integral+transforms+third+edition&hl=en&sa=X&ved=0ahUKEwj2rcjrz8DMAhXlCsAKHeQ7DjUQ6AEIKDAA#v=onepage&q=davies%20integral%20transforms%20third%20edition&f=false
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