1. Twilight observations from balloon altitude 1. Blue sunlight extinction and scattering by dust in to 60 km altitude atmospheric region;Ackerman;Aeronom. Acta A,1982
2. Aerosols at altitudes between 20 and 37 km;Bigg;Tellus,1970
3. Electron microscope photographs of extraterrestrial particles;Bigg;Tellus XXIII,1971
4. Evidence for haematite particles at 60 km altitude;Bohren;Nature,1984
5. Lidar and optical polarization measurements of the stratospheric cloud in Hawaii (abstract);Coulson;Trans. Am. Geophys. Union EOS,1982