MathSciNet bibliographic data MR1257286 11F72 (11-04 81-04 81Q50) Hejhal, Dennis A.; Rackner, Barry N. On the topography of Maass waveforms for ${\rm PSL}(2,{\bf Z})$${\rm PSL}(2,{\bf Z})$. Experiment. Math. 1 (1992), no. 4, 275–305. Article

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