1. Non-commutative geometry and string field theory
2. Conformal geometry and string field theory
3. M. Peskin, unpublished;
4. J. Lykken and S. Raby, unpublished.
5. G. Zemba and B. Zwiebach, Tadpole Graph in Covariant Closed String Field Theory, MIT preprint, MIT-CTP-1633; J. Math. Phys., to appear.