TY - JOUR T1 - On Some New Methods of Investigating the Sums of Several Classes of Infinite Series JF - Philosophical Transactions of the Royal Society of London (1776-1886) VL - 109 SP - 249 EP - 282 PY - 1819/01/01/ UR - http://dx.doi.org/10.1098/rstl.1819.0020 M3 - doi:10.1098/rstl.1819.0020 AU - Babbage, C. ER -