@misc{Perrin_M._R._Molar_1978,
 author={Perrin, M. R.},
 volume={23},
 number={28},
 copyright={Rights Reserved - Free Access},
 address={Białowieża},
 journal={Acta Theriologica},
 howpublished={online},
 year={1978},
 language={eng ; sum. eng. ; pol.},
 type={Text},
 title={Molar root-length as an indicator of age in Clethrionomys gapperi},
 URL={http://rcin.org.pl/Content/10516/PDF/BI002_2613_Cz-40-2_Acta-T23-nr28-423-434_o.pdf},
 keywords={age, Clethrionomys gapperi, indicator of age, molar root length, korzeń zęba, zęby trzonowe, wskaźnik wieku, nornica},
}