Christoffel, E. G., & Paal, Z. (1989). Laboratory studies of heterogeneous catalytic processes. Elsevier.

Christoffel, Erhard G., and Zoltan Paal. Laboratory Studies of Heterogeneous Catalytic Processes. Amsterdam ; New York: Elsevier, 1989.

Christoffel, Erhard G., and Zoltan Paal. Laboratory Studies of Heterogeneous Catalytic Processes. Elsevier, 1989.