We all know "Ardhanarishvara" form of Shiva & Shakti . Similarly. Vaikuntha-Kamalaja is depicted as Vishnu-Lakshmi ,half male and half female, split down the middle. The right half is the male Vishnu, illustrating his traditional attributes. The icon symbolises the oneness or non-duality of male and female principles of the universe.
My question is-
1) In which texts , we find mentioning of this composite form of Shri Vishnu and Shree Lakshmi. , (Preferably mentioning of one or two verses or passages related to this) from original scripture.
Image taken from This site.