@article{Zintl1936,
    author = "Zintl, E. and Harder, A.",
    title = "Zur Stoechiometrie binaerer Natriumverbindungen. (21. Mitteilung ueber Metalle und Legierungen)",
    journal = "Zeitschrift fuer Physikalische Chemie, Abteilung B: Chemie der Elementarprozesse, Aufbau der Materie",
    year = "1936",
    volume = "34",
    pages = "238-254",
    ASTM_id = "ZPCBAL"
}

@article{Lamprecht1968,
    author = "Lamprecht, G.J. and Dicks, L. and Crowther, P.",
    title = "A study of the solubility of metals in liquid sodium. II. The system sodium-lead",
    journal = "Journal of Physical Chemistry",
    year = "1968",
    volume = "72",
    pages = "1439-1441",
    ASTM_id = "JPCHAX"
}