Published in Contributions in Science, in 1967, in volume 122, pages 1-4

Published in Contributions in Science, in 1967, in volume 123, pages 1-8

Published in Contributions in Science, in 1967, in volume 124, pages 1-10

Published in Contributions in Science, in 1967, in volume 125, pages 1-16

Published in Contributions in Science, in 1967, in volume 126, pages 1-5

Published in Contributions in Science, in 1967, in volume 127, pages 1-5

Published in Contributions in Science, in 1967, in volume 128, pages 1-23

Published in Contributions in Science, in 1967, in volume 129, pages 1-22

Published in Contributions in Science, in 1967, in volume 130, pages 1-34