“…By 1908 approximately 750 heteropoly compounds had been reported and analyzed by over 250 authors, among the most active of whom were P. Chrétien, H. Copaux, H. von Euler-Chelpin, C. Friedheim, W. Gibbs, R. D. Hall, E. Marckwald, O. Pufahl, A. Rosenheim, E. F. Smith, and H. Struve. Rosenheim and Jaenicki 60b reviewed this early work.…”