Geodesic
Poincare series in $SL(3,\mathbb{R})$
Zapiski Nauchnykh Seminarov POMI, Analytical theory of numbers and theory of functions. Part 8, Tome 160 (1987), pp. 37-40

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It is shown that in the spectral decomposition of the one-parameter Poincaré series from $SL(3,\mathbb{R})$ involves only the discrete spectrum, induced from $SL_2$ and not the discrete spectrum of $SL_3$ itself. 
@article{ZNSL_1987_160_a3,
     author = {A. I. Vinogradov},
     title = {Poincare series in $SL(3,\mathbb{R})$},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {37--40},
     publisher = {mathdoc},
     volume = {160},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1987_160_a3/}
}
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A. I. Vinogradov. Poincare series in $SL(3,\mathbb{R})$. Zapiski Nauchnykh Seminarov POMI, Analytical theory of numbers and theory of functions. Part 8, Tome 160 (1987), pp. 37-40. http://geodesic.mathdoc.fr/item/ZNSL_1987_160_a3/