1. Program schemes with pushdown stores';Brown;SIAM J. Comput.,1972
2. On the Properties and Applications of Program Schemas;Chandra,1973
3. Chandra, A. and Manna, Z., Program schemas with equality, Proc. 4th ACM Symposium on Theory of Computing (1972).
4. On the power of programming features;Chandra;Stanford AI Memo,1973