• Breast milk and serum selenium levels in Finland, Estonia, St. Petersburg and KarelianKantola, M.; Vartiainen, T.; Mand, E.; Viitak, Anu; Tooming, M.; Juravskaja, J.; Purkunen, R.; Saarikoski, S.; Pasanen, M.Journal of trace elements in experimental medicine1995 / 2, p. 87