A virtual type for a multiple-type object and its implementation.

Hideki Sato Masayoshi Aritsugi A virtual type for a multiple-type object and its implementation. 25-35 2007 38 Systems and Computers in Japan 11 http://dx.doi.org/10.1002/scj.20781 db/journals/scjapan/scjapan38.html#SatoA07