@misc{Macdonald_S._M._Observations_1988,
 author={Macdonald, S. M. and Mason, C. F.},
 volume={33},
 number={30},
 copyright={Rights Reserved - Free Access},
 journal={Acta Theriologica},
 address={Białowieża},
 howpublished={online},
 year={1988},
 language={eng ; sum. eng. ; pol.},
 title={Observations on an otter population in decline},
 type={Text},
 URL={http://rcin.org.pl./Content/11302/PDF/BI002_2613_Cz-40-2_Acta-T33-nr30-434-415_o.pdf},
 keywords={contamination, decline, Lutra lutra, organochlorines, otter population, wydra, spadek liczebności populacji, skażenie},
}