A Series of Observations on, and a Discovery of, the Period of the Variation of the Light of the Bright Star in the Head of Medusa, Called Algol. In a Letter from John Goodricke, Esq. to the Rev. Anthony Shepherd, D. D. F. R. S. and Plumian Professor at Cambridge

J. Goodricke
1783 Philosophical Transactions of the Royal Society of London  
doi:10.1098/rstl.1783.0027 fatcat:gvn35m4eenfnpmaxxsbmjlspe4