Mathematische analyse des TOSAR-Verfahrens. - Ingeborg Nickelsen; Herbert Nickelsen (Inf. Storage Retr., 1973)

Representation of concept relations using the TOSAR system of the IDC: Treatise III on information retrieval theory. - Robert Fugmann; Herbert Nickelsen; Ingeborg Nickelsen; Jakob Hermann Winter (J. Am. Soc. Inf. Sci., 1974)

TOSAR-A System for the Structural Formula-Like Representation of Concept Connections in Chemical Publications. - Robert Fugmann; Herbert Nickelsen; Ingeborg Nickelsen; Jakob Hermann Winter (J. Chem. Inf. Comput. Sci., 1975)