1. History of Scientific Ideas;Whewell,1858
2. Collected Papers of Charles Sanders Peirce;Peirce,1958
3. Unended Quest;Popper,1976
4. How Does The Muon Differ From The Electron?;Perl;Phys. Today,1971
5. For an overall description of SPEAR, see B. Richter et al. (SPEAR publication) SP-01 (1971)