"Dr. Jan Valenta" . "Jan" . "Doc. RNDr. Jan Valenta, Ph.D." . "prof. RNDr. Jan Valenta, Ph.D." . "Mgr. Jan Valenta, Dr." . "Valenta" . "doc. RNDr. Jan Valenta, Ph.D." . "7725604" . "RNDr. Jan Valenta, Ph.D." . .