no. 1
Asymptotic growth of Markoff-Hurwitz numbers
Compositio Mathematica, Tome 94 (1994) no. 1, pp. 1-18 
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     number = {1},
     mrnumber = {1302308},
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     url = {https://www.numdam.org/item/CM_1994__94_1_1_0/}
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Baragar, Arthur. Asymptotic growth of Markoff-Hurwitz numbers. Compositio Mathematica, Tome 94 (1994) no. 1, pp. 1-18. https://www.numdam.org/item/CM_1994__94_1_1_0/

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