Multicolor Ramsey numbers via pseudorandom graphs
X. He, Y. Wigderson, The Electronic Journal of Combinatorics 27 (2020).

On the nonexistence of k reptile simplices in d^3 and d^4
J. Kyndl, Z. Patakova, The Electronic Journal of Combinatorics 24 (2017) 1–44.

Unified Hanani Tutte theorem
R. Fulek, J. Kyndl, D. Pálvölgyi, The Electronic Journal of Combinatorics 24 (2017).