%0 Journal Article %A Dominic Lanphier %T Maass operators and van der Pol-type identities for Ramanujan's tau function %J Acta Arithmetica %D 2004 %P 157-167 %V 113 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/aa113-2-3/ %R 10.4064/aa113-2-3 %G en %F 10_4064_aa113_2_3