Geodesic
A differential equation on the cover function of the hexagonal lattice by the trivalent tree
Fundamentalʹnaâ i prikladnaâ matematika, Tome 18 (2013) no. 6, pp. 91-94.

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We provide a differential equation on the cover function of the hexagonal lattice by the trivalent tree, formulated using the modular discriminant considered as a function on the hyperbolic plane. 
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K. V. Golubev. A differential equation on the cover function of the hexagonal lattice by the trivalent tree. Fundamentalʹnaâ i prikladnaâ matematika, Tome 18 (2013) no. 6, pp. 91-94. http://geodesic.mathdoc.fr/item/FPM_2013_18_6_a4/

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