Oleg Kadkin Feb 17, 2013:

Hi, Jack. All sources are of the same author. No doubt she is a great geologist, and in these cases she just have used a chemical term a bit liberally. Really, it doesn't matter too much.

Jack slep Feb 17, 2013:

For whatever its worth! Repeats but different sources.
"Petroleum geology - Theoretical and Applied Studies" >> Authors

www.ngtp.ru/rub/autors/EARogozina.eng.html
The generation of saturated and unsaturated homologs of methane is identified in small quantities. The balance calculations of the transformation of main ...
Rogozina E.A. Results of laboratory simulation of microbiological

www.ngtp.ru/rub/2012/47_2012.eng.html
Aug 1, 2012 – ... and the composition of the organic matter. The generation of saturated and unsaturated homologs of methane is identified in small quantities.
[PDF]
результаты лабораторного моделирования процессов ...

www.ngtp.ru/rub/1/47_2012.pdf - Translate this page
File Format: PDF/Adobe Acrobat
The generation of saturated and unsaturated homologs of methane is identified in small quantities. The balance calculations of the transformation of main

Oleg Kadkin Feb 16, 2013:

Да не надо, тематика геологическая, существенного влияния на содержание статьи это не оказывает. Но хороший рецензент на стадии рассмотрения допуска к печати это бы поправил.

Oleg Lozinskiy Feb 16, 2013:

Но в исходнике написано именно так: См.: http://www.ngtp.ru/rub/7/012.pdf

Будем 'исправлять' авторов научной статьи?

Oleg Kadkin Feb 16, 2013:

The corrected expression for this will be "saturated and unsaturated derivatives of CH4".