He published treatises and papers in journals and periodicals such as Vidici (1968), Filosofija (1969–70), Praxis (1969–71), Problemi (1969–90), Kamov (1970), Kolo (1970), Pitanja (1971), Dijalog (1977), Polja (1978), Gordogan (1979, 1982, 1983, 1985), Filozofska istraživanja (1984, 1986, 1988), Godišnjak za povijest filozofije (1984, 1990), Synthesis philosophica (1986) and others.
Vollmer subsequently moved to Czechoslovakia, to join the Skoda company for whom he designed a wheel/track light tank, the KH-50 (Kolo-Housenka).
Nickson Kolo is a rugby league player, a blockbusting forward who plays for the newly formed club Gulf Isapeas in the Digicel Cup in Papua New Guinea, He is a former Papua New Guinea international.
From 1993 to 2002, Mlakar hosted Kolo sreće, a Croatian version of Wheel of Fortune.