@article{Nguyen Thi:2001,
  author  = "B. Nguyen Thi and E. Obertyńska",
  title   = "Sanitary analysis of crude and composted activated sludge",
  journal = "Acta Microbiologica Polonica",
  volume  = "Vol. 50",
  number  = "no 2",
  pages   = "149--154",
  year    = "2001",
}