Edge-Connectivity and Pairwise Disjoint Perfect Matchings in Regular Graphs
Y. Ma, D. Mattiolo, E. Steffen, I.H. Wolf, Combinatorica 44 (2024) 429–440.

Sets of r-graphs that color all r-graphs
Y. Ma, D. Mattiolo, E. Steffen, I.H. Wolf, ArXiv:2305.08619 (2023).

Pairwise Disjoint Perfect Matchings in r-Edge-Connected r-Regular Graphs
Y. Ma, D. Mattiolo, E. Steffen, I.H. Wolf, SIAM Journal on Discrete Mathematics 37 (2023) 1548–1565.

Bounds for the chromatic index of signed multigraphs
E. Steffen, I.H. Wolf, Discrete Applied Mathematics 337 (2023) 185–189.

Rotation r-graphs
E. Steffen, I.H. Wolf, Discrete Mathematics (2023).

Even Factors in Edge-Chromatic-Critical Graphs with a Small Number of Divalent Vertices
E. Steffen, I.H. Wolf, Graphs and Combinatorics 38 (2022).