SACRAMENTO, Calif. - The California Public Employees Retirement System (CalPERS), the arm of the State of California that provides retirement benefits to state employees, on Feb. 10 filed a brief in the U.S. Bankruptcy Court for the Eastern District of California opposing the plan of adjustment filed by the bankrupt City of Stockton, contending that the city's plan inappropriately treats the CalPERS pension plan as an executory contract (In Re: City of Stockton, Calif., No. 12-32118, Chapter 9, C.D. Calif. Bkcy.).