A unified treatment of the algebra of Stokes parameters and the coherency matrix is presented. Explicit formulas are given which relate the Jones and Mueller matrix formulations to the coherency matrix, and to themselves. The general method involves the trace of products of matrices, and the algebra is both useful and capable of generalization.
ROBERT W. SCHMIEDER, "Stokes-Algebra Formalism," J. Opt. Soc. Am. 59, 297-302 (1969)