David Bustard has written:

'Concurrent program structures' -- subject(s): Parallel programming (Computer science)

'Concurrent Programme Structures'

Per Brinch Hansen has written:

'The Origins of Concurrent Programming'

'The architecture of concurrent programs' -- subject(s): Concurrent Pascal (Computer program language), Operating systems (Computers)

'RC 4000 software multiprogramming system' -- subject(s): Programming, RC 4000 (Computer)

'Network'

'Operating system principles' -- subject(s): Management, Computer programming, Operating systems (Computers)

'RC 4000 software; slang assembler' -- subject(s): RC 4000 (Computer), Programming, Programming languages (Electronic computers)

Pascal. Ada-1983 then extended Pascal concurrency.

http://en.wikipedia.org/wiki/Concurrent_Pascal

(d) Hardware programming languages are concurrent in nature and executed a piece of code in parallel while a software programming language are sequential in nature and executed a piece of code sequentially.

James R. Cordy has written:

'Specification of Concurrent Euclid (version 1)' -- subject(s): Concurrent Euclid (Computer program language), Electronic data processing

'A diagrammatic approach to programming language semantics' -- subject(s): Semantics, Programming languages (Electronic computers)