Published in Contributions In Science (Los Angeles), in 1983, in volume 343, pages 1-11
Published in Contributions In Science (Los Angeles), in 1983, in volume 344, pages 1-13
Published in Contributions In Science (Los Angeles), in 1983, in volume 345, pages 1-19
Published in Contributions in Science (Los Angeles), in 1983, in volume 346, pages 1-6