Characteristics of modular finite-length lattices Otomar Hájek — 1965 Czechoslovak Mathematical Journal
Representation of finite-length modular lattices Otomar Hájek — 1965 Czechoslovak Mathematical Journal
Функциональные уравнения тригонометрических функций Otomar Hájek — 1955 Czechoslovak Mathematical Journal
Prolongation of sections in local dynamical systems Otomar Hájek — 1966 Czechoslovak Mathematical Journal
Homological fixed point theorems Otomar Hájek — 1964 Commentationes Mathematicae Universitatis Carolinae
Differentiable representation of flows (Preliminary communication) Otomar Hájek — 1966 Commentationes Mathematicae Universitatis Carolinae
Homological fixed point theorems. II Otomar Hájek — 1964 Commentationes Mathematicae Universitatis Carolinae