@misc{Block_Henrik_(1882–1928)_Lineära_1912,
 author={Block, Henrik (1882–1928)},
 editor={Nielsen, Niels. Ed.},
 copyright={Public Domain},
 address={Kjøobenhavn},
 address={Kristiania},
 howpublished={online},
 year={1912},
 publisher={Gyldendalske Boghandel Nordisk Forlag},
 language={swe},
 title={Lineära partiella differentialekvationer med multipla karakteristiker},
 type={Text},
 URL={http://rcin.org.pl/Content/79956/PDF/WA35_104742_4567_Beretning-16.pdf},
}