@article{10_4064_aa113_2_3,
     author = {Dominic Lanphier},
     title = {Maass operators and van der {Pol-type} identities
 for {Ramanujan's} tau function},
     journal = {Acta Arithmetica},
     pages = {157--167},
     publisher = {mathdoc},
     volume = {113},
     number = {2},
     year = {2004},
     doi = {10.4064/aa113-2-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa113-2-3/}
}