@misc{lightweight+concrete+contribution+to+the+symposium+ceb+betony+lekkie+materialy+na+sympozjum+ceb+comite+europeen+du+beton,
    title = {Lightweight concrete : contribution to the Symposium CEB i Betony lekkie : materiały na Sympozjum CEB (Comité Européen du Beton)},
    address = {Kraków},
    publisher = {Politechnika Krakowska},
    date = {1973},
    ISSN = {0454-4862}
}