KUPFERSCHMID, Andrea D. - SCHÖNENBERGER, Walter - WASEM, Ulrich. Tree regeneration in a Norway spruce snag stand after tree die-back caused by Ips typographus. In Forest snow and landscape research. - Eidgenössische Forschungsanstalt für Wald, Schnee und Landschaft : Birmensdorf. ISSN 1424-5108, 2002, vol. 77, no. 1-2, s. 149-160.