1.
|
London : Bowker, 1978. Second edition.
English | D 23 LEW.S |
Available |
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2.
|
Vienna [Austria] : Austrian Patent Office, 1977.
English | E 2317G170 WIPO.VC 1977 |
Available |
|
3.
|
München : K.G. Saur, 1996.
English | D 23 POL.M |
Available |
|
4.
|
München : K.G. Saur, 1995.
Spanish | D 23 PON.B |
Available |
|
5.
|
München : K.G. Saur, 1995. Second revised edition.
English | D 23 RIS.W |
Available |
|
6.
|
Westport : Meckler, c1990.
English | D 235 COM(4) |
Available |
|
7.
|
Geneva [Switzerland] : United Nations, 1992.
English | D 235 UN.T |
Available |
|