Published in Phegea, in 1989, in volume 17, issue 1, pages 1-18

Published in Phegea, in 1989, in volume 17, issue 1, pages 19-25

Published in Phegea, in 1989, in volume 17, issue 1, pages 31-33

Published in Phegea, in 1989, in volume 17, issue 1, pages 35-42

Published in Phegea, in 1989, in volume 17, issue 2, pages 49-52

Published in Phegea, in 1989, in volume 17, issue 2, pages 53-54

Published in Phegea, in 1989, in volume 17, issue 2, pages 55-56

Published in Phegea, in 1989, in volume 17, issue 2, pages 57-60

Published in Phegea, in 1989, in volume 17, issue 2, pages 67-73

Published in Phegea, in 1989, in volume 17, issue 2, pages 82

Published in Phegea, in 1989, in volume 17, issue 2, pages 83-90

Published in Phegea, in 1989, in volume 17, issue 3, pages 93-102

Published in Phegea, in 1989, in volume 17, issue 3, pages 103

Published in Phegea, in 1989, in volume 17, issue 3, pages 105-106

Published in Phegea, in 1989, in volume 17, issue 3, pages 107-117

Published in Phegea, in 1989, in volume 17, issue 3, pages 117-118

Published in Phegea, in 1989, in volume 17, issue 3, pages 119-121

Published in Phegea, in 1989, in volume 17, issue 3, pages 123-135

Published in Phegea, in 1989, in volume 17, issue 4, pages 137-143

Published in Phegea, in 1989, in volume 17, issue 4, pages 143

Published in Phegea, in 1989, in volume 17, issue 4, pages 161-164

Published in Phegea, in 1989, in volume 17, issue 4, pages 165-167

Published in Phegea, in 1989, in volume 17, issue 4, pages 169-221