Modelling OSI in SDL. - Ferenc Belina; Dieter Hogrefe; Sebastiano Triglia (FORTE, 1988)

The CCITT-Specification and Description Language SDL. - Ferenc Belina; Dieter Hogrefe (Comput. Networks, 1989)

SDL - with applications from protocol specification. - Ferenc Belina; Dieter Hogrefe; Amardeo Sarma (Prentice Hall, 1991)