1964: Functional Differential Calculus of Operators. Journal of Mathematical Physics 5, 324-331.
1966: Functional Differential Calculus of Operators II. Journal of Mathematical Physics 7, 482-493.
This is a generalization of functional differentiation first introduced by Schwinger for unquantized fields to the case of quantized fields. It is done in configuration space (1964) and in momentum space (1966), and is applicable to spin 0, ½ and 1 fields.
1966: Asymptotic Quantum Field Theory. Pp. 295-315 in “Perspectives in Modern Physics”, Essays in Honor of Hans A. Bethe, R.E. Marshak (ed.). Interscience Publishers, New York.
This is a review article.
1967: Quantum Field Theory and Generalized Functions. Acta Physica Austriaca Supplement IV, 228-268.
Lectures at the Winter Conference in Schladming, Austria.
1969: Theory of the Scattering Operator I. Physical Review 183, 1359-1371.
1970: Theory of the Scattering Operator II. Physical Review D 1, 1640-1653. With A. Pagnamenta.
This S-matrix theory is related to the LSZ approach but without their asymptotic conditions. It is applied to ??n models in perturbation expansion.
1970: The coherent state representation in quantum field theory. Pp.279-302 in “Analytic Methods in Mathematical Physics”, R. P. Gilbert and R. G. Newton (eds.), Gordon and Breach, New York.
1971: Quantum Field Theory Off Null Planes. Nuovo Cimento 1A, 625-644. With R. A. Neville.
The QFT for spin 0 and spin ½ fields with initial conditions on a null plane is developed.
1972: Dilatation and Conformal Invariance on Null Planes. Nuovo Cimento 7B, 166-174. With L. Streit.
The conditions for a scalar field to transform covariantly under dilatation and conformal transformations on a null plane are given.
There exist about a dozen other publications in QFT.