Ibn Hazm notably mentions the narrations about it in his al-Muhalla Vol 8 pg. 506:
وروي : أن علي بن أبي طالب - به شهد - لفاطمة - رضي الله عنها - عند أبي بكر الصديق له ومعه أم أيمن فقال له أبو بكر: لو شهد معك رجل أو امرأة أخرى لقضيت لهـا بذلك.
It has been narrated that Ali b. Abi Talib (as) bore witness for Fatima (sa) before Abu Bakr and with him also Umm Ayman. Then Abu Bakr said to him: "If another man bears witness with you or another woman, I will accept it.”
Alkarbala