Equations in finite semigroups: explicit enumeration and asymptotics of solution numbers. - Christian Krattenthaler; Thomas W. Müller (J. Comb. Theory A, 2004)

A note on higher-dimensional magic matrices. - Peter J. Cameron; Christian Krattenthaler; Thomas W. Müller (Australas. J Comb., 2011)

A Method for Determining the Mod-2k Behaviour of Recursive Sequences, with Applications to Subgroup Counting. - Manuel Kauers; Christian Krattenthaler; Thomas W. Müller (Electron. J. Comb., 2011)

A Riccati differential equation and free subgroup numbers for lifts of PSL2(Z)PSL2(Z) modulo prime powers. - Christian Krattenthaler; Thomas W. Müller (J. Comb. Theory A, 2013)

Motzkin numbers and related sequences modulo powers of 2. - Christian Krattenthaler; Thomas W. Müller (Eur. J. Comb., 2018)

Free subgroup numbers modulo prime powers: The non-periodic case. - Christian Krattenthaler; Thomas W. Müller (J. Comb. Theory A, 2018)