Modula-2+

P. Rovner et al, DEC SRC, Palo Alto CA, 1984

An extension of Modula-2 with exceptions and threads.

"Modula-2+ User's Manual", M-C van Leunen.

"Extending Modula-2 to Build Large, Integrated Systems", P. Rovner, IEEE Software 3(6):46-57 (Nov 1986).