Šemrl Peter: Groups of order automorphisms of operator intervals. In: Acta scientiarum mathematicarum, (84) 1-2. pp. 125-136. (2018)
Šemrl Peter: Non-linear commutativity preserving maps. In: Acta scientiarum mathematicarum, (71) 3-4. pp. 781-819. (2005)
Šemrl Peter: Order-preserving maps on the poset of idempotent matrices. In: Acta scientiarum mathematicarum, (69) 3-4. pp. 481-490. (2003)
Brešar Matej; Molnár Lajos; Šemrl Peter: Elementary operators. II. In: Acta scientiarum mathematicarum, (66) 3-4. pp. 769-791. (2000)
Šemrl Peter: Linear maps that preserve the nilpotent operators. In: Acta scientiarum mathematicarum, (61) 1-4. pp. 523-534. (1995)