History Opinion Leadership in the Research of Lazarsfeld, Merton, and Others (Excerpt) Abstract: The article describes the four main studies dealing with the concept of opinion leadership: the studies People’s Choice, Rovere, Decatur and Elmira. Out of these four, three were authored or co-authored by Paul Lazarsfeld. Official History in Slovak and Czech Law (Excerpt) Abstract: The article deals with the concept of official history. It lists some examples of official history from current Slovak and Czech law, suggests a classification of official history and briefly discusses theoretical questions related to official history.