1. Burlaga, L.F., Solar Physics 4, 67, 1968.
2. Burlaga, L.F., Cosmic Electrodynamics 1, 233, 1970.
3. Burlaga, L.F. and J.K. Chao, J. Geophys. Res. (1971). To be published.
4. Chao, J.K., Interplanetary Collisionless Shock Waves, MIT Center for Space Research, CSR TR-70–3, 1970.
5. Chao, J.K. and S. Olbert, J. Geophys. Res. 75, 6394, 1970.