1 http://hdl.handle.net/10338.dmlcz/127264 1 Extension theorems (vector measures on quantum logics) http://hdl.handle.net/10338.dmlcz/127281 Extension theorems (vector measures on quantum logics) Quasi $M$-compact spaces http://hdl.handle.net/10338.dmlcz/127280 Quasi $M$-compact spaces On the set of all shortest paths of a given length in a connected graph http://hdl.handle.net/10338.dmlcz/127279 On the set of all shortest paths of a given length in a connected graph Construction of all homomorphisms of groupoids http://hdl.handle.net/10338.dmlcz/127278 Construction of all homomorphisms of groupoids