Broken ties: reciprocity and other factors affecting the termination of older adults' relationships. - Karen Klein Ikkink; Theo van Tilburg (Soc. Networks, 1999)

Network contact changes in early and later postseparation years. - Elisabeth L. Terhell; Marjolein I. Broese van Groenou; Theo van Tilburg (Soc. Networks, 2007)

The ties that bother: Difficult relationships in the personal networks of older adults. - Lea Ellwardt; Theo van Tilburg (Soc. Networks, 2026)