Sayyiduna Abu Umamah bin Sahl narrates from his father (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) offered the funeral prayer at the grave of a woman and said four takbirs.
Sufyan bin Husayn narrated it like this; the correct version is the narration of Malik and those who followed him, as mursal, without mention of his father in it.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنائز / 6936