Computational Number Theory, Henri Cohen (2000, ISBN 0-387-98727-4) One-Parameter Semigroups for Linear Evolution Equations, Engel, Nagel (2000, ISBN 978-0-387-98463-6)
e f g h i j k “Gold & Platin” (To access, user must enter the search parameter "Katy Perry" as Interpret). International Federation of the Phonographic