Biological reproduction
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Paternity Identification in Twins with Different Fathers ". Journal of Forensic Science July; 39(4), 1100-2.
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Is it possible for fraternal twins to have different fathers? " at The Straight Dope
The Straight Dope: Is it possible for fraternal twins to have different fathers?
Heteropaternal Superfecundation people virginia
A case of twins with probable superfetation a report of a case of superfetation demonstrated through different paternity of twins.
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Superfetation in Beef Cattle Cattle Doctoral Thesis; Joel Andrew Carter, Louisiana State University, Defended 2002-03-18
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