A Logic-Based Concurrent Object-Oriented Programming Language
   Article Rafael Ramirez.
   http://citeseer.ist.psu.edu/rd/46765635%2C157428%2C1%2C0.25%2CDownload/http://citeseer.ist.psu.edu/cache/papers/cs/3588/http:zSzzSzwww.cs.bris.ac.ukzSzToolszSzReportszSzPszSz1996-ramirez.pdf/melendez97logicbased.pdf

Tempo: a declarative concurrent programming language
   Based on classical first-order logic; improves on usual concurrent logic languages (eg, Parlog) by explicitly specifying aspects of behavior of concurrent programs, namely: safety properties; gives advantages in writing concurrent programs and manipulatin
   http://citeseer.ist.psu.edu/rd/46765635%2C519806%2C1%2C0.25%2CDownload/http://citeseer.ist.psu.edu/cache/papers/cs/21257/http:zSzzSzwww.cs.bris.ac.ukzSz~stevezSzresearchzSzpaperszSztempo.pdf/gregory95tempo.pdf