problems.bib

@book{chopra,
    author = {Chopra, A.},
    title = {Dynamics of structures, SI Edition},
    publisher = {Pearson},
    isbn = {1-292-24920-X},
    edition = {7th edition, EBook},
    url = {https://discovery.upc.edu/permalink/34CSUC_UPC/11q3oqt/alma991005094074806711}
}

@book{blanco,
    author = {Blanco Díaz, Elena},
    title = {Análisis experimental de estructuras},
    address = {Barcelona},
    isbn = {978-8-49-673647-4},
    publisher = {CIMNE},
    year = {2008},
    url = {https://discovery.upc.edu/permalink/34CSUC_UPC/rdgucl/alma991003525819706711}
}

@book{clough,
    author = {Clough, Ray W.},
    title = {Dynamics of structures },
    address = {Berkeley},
    booktitle = {Dynamics of structures},
    edition = {2nd ed. (rev.)},
    isbn = {0923907505},
    publisher = {Computers and Structures},
    year = {2003},
    url = {https://discovery.upc.edu/permalink/34CSUC_UPC/11q3oqt/alma991003166869706711}
}