@article{6aea88c3f5f74347bb42bc2c98fbbcf4,
title = "First integral and integral invariant of Birkhoffian system",
abstract = "The variational equation of the Birkhoffian system is established, by which it is proved that an integral invariant can be constructed with a known first integral. And its inverse is also correct.",
keywords = "Analytical mechanics, Birkhoffian system, First integral, Integral invariant",
author = "F. Mei and H. Wu",
year = "2000",
doi = "10.1007/BF02884939",
language = "English",
volume = "45",
pages = "412--414",
journal = "Chinese Science Bulletin",
issn = "1001-6538",
publisher = "Elsevier B.V.",
number = "5",
}