References
- Boyde, A., Barber, V.C. Freeze-drying mcthods for the scanning electron-microscopical study of the protozoan Spirostomum ambiguum and the statocyst of the cephalopod mollusc Loligo vulgaris J. Cell Sci., 4, 223–39, 1969.
- Small, E.B, Marszalek, D.S. Scanning electron microscopy of fixed, frozen, and dried protozoa Science, 163, 1064–5, 1969.