+++1_Springer and 1_Whiley

[GoldFinger]

Уважаемы коллеги, необходима Ваша помощь в скачивании статей. Заранее большое спасибо!
Helium industry in Russia and world experience with the development and operation of helium equipment
I. L. Andreev
Chemical and Petroleum Engineering
Volume 31, Number 2, 73-85

DOI:

http://dx.doi.org/10.1007/BF01147379

Separation of a helium-methane mixture in permeators with two types of polymer membranes
J. E. Perrin, S. A. Stern
AIChE Journal
Volume 32, Issue 11, pages 1889–1901, November 1986

DOI:

http://dx.doi.org/10.1002/aic.690321115

[eFo]

[GoldFinger]

eFo, большое спасибо!