@misc{composites+based+on+polypropylene+modified+with+natural+fillers+to+increase+stiffness,
    author = {Kufel, Anna i Kuciel, Stanisław},
    title = {Composites based on polypropylene modified with natural fillers to increase stiffness},
    journal = {Technical Transactions},
    address = {Kraków},
    publisher = {<a href=\"http://www.wydawnictwo.pk.edu.pl/\" target=\"_blank\">Wydawnictwo PK</a>},
    date = {2019},
    number = {Vol. 116, iss. 1},
    ISSN = {0011-4561}
}