random walk - Borromean rings’ complement Cayley tree European pine sawfly (Neodiprion sertifer Geoffr.) Pinus Sylvestris L. Pinus sylvestris L. Riemann surfaces in genus two advection annual allowable cutting forecast area quantization coppice stands decorated Teichm¨uller space diffusion focus of mass propagation forest management planning materials forest stands fundamental group geometrodynamics growing stock change inhomogeneous environment maturity age mensuration indicators normal harvesting outbreak of mass propagation planted stands quality classes rational harvesting score of the stand damage threat sine-Gordon equation