Jan A. Bergstra, C. A. Middelburg. Model Theory for Process Algebra. In Aart Middeldorp, Vincent van Oostrom, Femke van Raamsdonk, Roel C. de Vrijer, editors, Processes, Terms and Cycles: Steps on the Road to Infinity, Essays Dedicated to Jan Willem Klop, on the Occasion of His 60th Birthday. Volume 3838 of Lecture Notes in Computer Science, pages 445-495, Springer, 2005. [doi]