Largest known twin primes. - Karl-Heinz Indlekofer; Antal Járai (Math. Comput., 1996)

Largest known twin primes and Sophie Germain primes. - Karl-Heinz Indlekofer; Antal Járai (Math. Comput., 1999)

On q-multiplicative functions taking a fixed value on set of primes. - Karl-Heinz Indlekofer; Imre Kátai (Period. Math. Hung., 2001)

Mean behaviour of multiplicative functions on additive arithmetical semigroups. - Karl-Heinz Indlekofer; S. Wehmeier (Comput. Math. Appl., 2006)