Geodesic
Weierstrass Points at the Cusps of Γ0(16p) and Hyperellipticity of Γ0(n)
Canadian journal of mathematics, Tome 23 (1971) no. 6, pp. 960-968

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For a fixed positive integer n we consider the subgroup Γ0(n) of the modular group Γ(l). Γ0(n) consists of all linear fractional transformations L: z → (az + b)/(cz + d) with rational integers a, b, c, d, determinant ad – bc = 1, and c ≡ 0(mod n). If H = {z|z = x + iy, x and y real and y > 0} is the upper half of the z-plane then S 0 = S 0(n) = H/Γ0(n), properly compactified, is a compact Riemann surface whose genus we denote by g(n). A point P of a Riemann surface S of genus g is called a Weierstrass point if there exists a function on S that has a pole of order α ≦ g at P and is regular everywhere else on S.Lehner and Newman started the search for Weierstrass points of S 0 (or, loosely, of Γ0(n)). 
Larcher, H. Weierstrass Points at the Cusps of Γ0(16p) and Hyperellipticity of Γ0(n). Canadian journal of mathematics, Tome 23 (1971) no. 6, pp. 960-968. doi: 10.4153/CJM-1971-103-6
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