TY - JOUR T1 - Further Researches on the Temperature Classification of Stars JF - Proceedings of the Royal Society of London (1854-1905) VL - 73 SP - 227 EP - 238 PY - 1904/01/01/ UR - http://dx.doi.org/10.1098/rspl.1904.0036 M3 - doi:10.1098/rspl.1904.0036 AU - Lockyer, N. ER -