Reference

Christa Schafellner, Roland Berger, J. Mattanovich, Erwin Führer (1994): Food quality of spruce needles and the performance of the Little Spruce Sawfly, Pristiphora abietina (Hym., Tenthredinidae). The protein precipitating ability of the young needles. – Acta Horticulturae – 381: 717 - 720.