C. Rasmussen, D. Moody, Character sums determined by low degree isogenies of elliptic curves, to appear in Rocky Mountain J. Math (2013).
D. Moody, A. Zargar, On Integer solutions of x4+y4-2z4-2w4=0, No. Theory and Discrete Math. 19 (1), pp. 37-43 (2013).
D. Moody, D. Shumow. Isogenies on Edwards and Huff curves, (submitted 2011)