Whether a guilt offering which is to be left to develop a blemish and be sold has the status of a voluntary burnt offering: Temurah 18a, 18b-19a
Bringing a voluntary burnt offering with the proceeds from the sale of a substitute for a guilt offering, or a guilt offering's child: Temurah 18b, 20b
Using leftover funds from purchase of a sin offering, for a voluntary burnt offering: Zevachim 11b; Temurah 22b-24a