Conference Paper (international conference)
: Proceedings of the 10th Conference on Probability and Mathematical Statistics. PROBASTAT '91, p. 404-408 , Eds: Pázman A., Volaufová J.
: Univerzita Komenského, (Bratislava 1992)
: PROBASTAT '91 /10./, (Bratislava, CS, 26.08.1991-30.08.1991)