Published in Scopus, in 1987, in volume 9, pages 146-159
Published in Scopus, in 1987, in volume 11, pages 1-5
Published in Scopus, in 1987, in volume 11, pages 6-8
Published in Scopus, in 1987, in volume 11, pages 9-12
Published in Scopus, in 1987, in volume 11, pages 13-18
Published in Scopus, in 1987, in volume 11, pages 19
Published in Scopus, in 1987, in volume 11, pages 23
Published in Scopus, in 1987, in volume 11, pages 33-37
Published in Scopus, in 1987, in volume 11, pages 38-41
Published in Scopus, in 1987, in volume 11, pages 41-43
Published in Scopus, in 1987, in volume 11, pages 44-46
Published in Scopus, in 1987, in volume 11, pages 46
Published in Scopus, in 1987, in volume 11, pages 47-51
Published in Scopus, in 1987, in volume 11, pages 52-53