Approximation Theory and the Calculation of Energies from Divergent Perturbation Series
L. S. Luo and J. Nuttall
Phys. Rev. Lett. 57, 2241 (1986) - Published 3 November, 1986
New Variables for Classical and Quantum Gravity
Abhay Ashtekar
Phys. Rev. Lett. 57, 2244 (1986) - Published 3 November, 1986