by Greenberg, Michael D.
by Gradshteyn, I. S | Ryzhik, I. M.
by Protter, Murray H.
by Mohaupt, Thomas.
by Stern, Robert.
by Epstein, Joshua M.
by Needham, Tristan.
by Quinn, Terrance | Boudhraa, Zine | Rai, Sanjay.
by Davvaz, Bijan.
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