Renormalization of cocycles and linear ODE with almost-periodic coefficients. Marek Rychlik — 1992 Inventiones mathematicae
The Equichordal Point Problem. Rychlik, Marek — 1996 Electronic Research Announcements of the American Mathematical Society [electronic only]
Algebraic non-integrability of the Cohen map. Rychlik, Marek; Torgerson, Mark — 1998 The New York Journal of Mathematics [electronic only]