1. Forest Measurements, 4th ed, McGraw-Hill series in Forest Resources;Avery,1994
2. L'Aménagement Des Forêts par La Méthode Expérimentale Et Spécialement la Méthode du Contrôle (Forest management Using the Experimental method, Especially the Control Method);Biolley,1920
3. The Relascope Idea: Relative Measurements in Forestry;Bitterlich,1984
4. Die Winkelzählprobe (Angle-count Sampling);Bitterlich,1949
5. Spatial sampling with R;Brus,2022