Published in Apex (Brussels), in 1988, in volume 3, pages 21-37

Published in Apex (Brussels), in 1988, in volume 3, pages 39-46

Published in Apex (Brussels), in 1988, in volume 3, pages 47-54

Published in Apex (Brussels), in 1988, in volume 3, pages 55-62

Published in Apex (Brussels), in 1988, in volume 3, pages 63-66

Published in Apex (Brussels), in 1988, in volume 3, pages 67-80

Published in Apex (Brussels), in 1988, in volume 3, pages 81-87