Original Einstein-Straus Paper

A. Einstein and E.G. Straus, Ann. Math. Vol. 47 (1946) p.731

Einstein's Generalized Bianchi Identities Paper

A. Einstein, Canadian Journal of Mathematics, Vol. 2, (1950), p.120

An excerpt from Einstein's "autobiography"

Albert Einstein: Philosopher-Scientist (edited by P. A. Schilpp), (1949)

Original Schrodinger Affine Field Theory Paper

E. Schrodinger, Proceedings of the Royal Irish Academy, Vol. 51A, (1947) p. 163

Some good books on the subject are presently available at Amazon.com:

E. Schrodinger, "Space Time Structure" (Cambridge University Press, London, 1950)

A. Einstein, "The Meaning of Relativity", 5th edition, revised (Princeton University Press, Princeton, NJ, 1956)

P. A. Schilpp, "Albert Einstein: Philosopher-Scientist" (Open Court Publishing, Peru IL, 1949)