@article{article830ec921,
title   = {Pressure field in a tube with a general and arbitrary time- and position-dependent gas source},
author = {Degasperi, F T and Martins, Marcos Nogueira and Takahashi, Jiro and Verardi, Sérgio Luís Lopes},
year = {2004},
doi = {10.1116/1.1778408},
journal   = {Journal of Vacuum Science & Technology A}
}