Zeilberger, Doron The irrationality measure of $\pi$ is at most 7.103205334137... Moscow Journal of Combinatorics and Number Theory 9 (2020) 407–419 Zhelezov, Dmitrii Convex sequences may have thin additive bases Moscow Journal of Combinatorics and Number Theory 8 (2019) 43–46 Zhukovskii, Maksim First order definitions of subgraph isomorphism through the adjacency and order relations Moscow Journal of Combinatorics and Number Theory 9 (2020) 293–302 Zudilin, Wadim The irrationality measure of $\pi$ is at most 7.103205334137... Moscow Journal of Combinatorics and Number Theory 9 (2020) 407–419