8Kelessidis V C, Roberts G L, Williams J M. New system provides continuous quantitative analysis of gas concentration in the mud while drilling. Society of Petroleum Engineers of AIME, (Paper) SPE, DELTA, Drilling, 1989,447-456.
9Drnec M L, Spoerker H F. Critical Evaluation of Gas Monitoring Systems as Currently hnplemented in Hydrocarbon Drilling Operations. SPE Proceedings-Gas Technology Symposium, SPE 40029,1998,387-394.
10Eva Matisova. Fast gas chromatography and its use in trace a-nalysis. J. Chromatogr A, (1000),2003,199-221.
