1. Foss Tecator Application Note AN 300, Ver 4.0pl. Determination of Nitrogen according to Kjeldahl using Block Digestion and Steam Distillation (in Polish).
2. Impacts of the invasive plant Fallopia japonica (Houtt.) on plant communities and ecosystem processes;Aguilera;Biol. Invasions,2010
3. PERMANOVA+ for PRIMER: guide to software and statistical methods;Anderson,2008
4. Glomeromycota;Błaszkowski,2012
5. Working with mycorrhizas in forestry and agriculture;Brundrett,1996