@misc {IOPORT.03566156,
    author       = {Pelagatti, G. and Paolini, P. and Bracchi, G.},
    title        = {Mappings in database systems.},
    howpublished = {Inf. Process. 77, Proc. IFIP Congr., Toronto 1977, 447-452 (1977).},
    year         = {1977},
    identifier   = {03566156},
}