Proceedings of the American Mathematical Society
The partial integration formula for product integrals of which the Trotter product formula is a consequence, is established for a wide class of unbounded operator-valued functions.
First published in Proceedings of the American Mathematical Society in 1986, published by the American Mathematical Society.
Hughes, Rhonda J. "A Partial Integration Formula for Product Integrals of Unbounded Operator-Valued Functions." Proc. Amer. Math. Soc. 96 (1986): 455-461.