The following can be of some help:
Isa Ragusa: "The egg reopened", The Art Bulletin, LIII (1971), pp.
435-44
Although the author's main interest is Piero della Francesca's
"Madonna di Brera" and the ostrich egg hanging in the apse, she cites
medieval authors such as Albertus Magnus and Durandus concerning the ostrich
symbolism.
Best Regards
Carlos
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