@article{Porankiewicz:2011,
  author  = "B. Porankiewicz and B. Axelsson and A. Grönlund and B. Marklund",
  title   = "Main and normal cutting forces by machining wood of Pinus sylvestris",
  journal = "BioResources [online]",
  number  = "no 4",
  pages   = "3687--3713",
  year    = "2011",
  note    = "http://www.ncsu.edu/bioresources/ [dostęp: 22.08.2011]",
}