Bobbink R, Braun S, Nordin A, Power S, Schutz K, Strengbom J, Weijters M, Tomassen H. Review and revision of empirical critical loads and dose-response relationships. (Bobbink R, Hettelingh JP). Noordwijkerhout: Coordination Centre for Effects; 2011.

Strengbom J, Nordin A, Ndsholm T, Ericson L. Slow recovery of boreal forest ecosystem following decreased nitrogen input. . Functional Ecology. 2001  ;15:451-457.

Strengbom J, Nordin A, Näsholm T, Ericson L. Slow recovery of boreal forest ecosystem following decreased nitrogen input. Functional Ecology . 2001  ;15:451-457.