International Conference on Software Engineering for Telecommunication Switching Systems, Helsinki, Institution of Electrical Engineers (Great Britain). Electronics Division, & British Computer Society. (1978). Third International Conference on Software Engineering for Telecommunication Switching Systems, 27-29 June 1978, organised by the Electronics Division of the Institution of Electrical Engineers in association with the British Computer Society ... [et al.], venue DIPOLI Congress Centre, Helsinki, Finland. I.E.E..

International Conference on Software Engineering for Telecommunication Switching Systems, Helsinki, Institution of Electrical Engineers (Great Britain). Electronics Division, e British Computer Society. Third International Conference on Software Engineering for Telecommunication Switching Systems, 27-29 June 1978, Organised by the Electronics Division of the Institution of Electrical Engineers in Association with the British Computer Society ... [et Al.], Venue DIPOLI Congress Centre, Helsinki, Finland. London: I.E.E., 1978.

International Conference on Software Engineering for Telecommunication Switching Systems, Helsinki, et al. Third International Conference on Software Engineering for Telecommunication Switching Systems, 27-29 June 1978, Organised by the Electronics Division of the Institution of Electrical Engineers in Association with the British Computer Society ... [et Al.], Venue DIPOLI Congress Centre, Helsinki, Finland. I.E.E., 1978.