Compatible stem taper and stem volume functions for oak (Quercus robur L and Q petraea (Matt) Liebl) in Denmark MJ Tarp-Johansen, JP Skovsgaard, SF Madsen, VK Johannsen and I Skovgaard Ann. For. Sci., 54 7 (1997) 577-595 DOI: 10.1051/forest:19970701