Socio-economic planning sciences - New York: Pergamon Press Ltd. - v.p.

Sanction dt. 30/09/1982(wdr no.1443;acc.no.10682)
Sanction dt. 30/09/1982(wdr no.1444-46;acc.no.11755-57)
Sanction dt. 30/09/1982(wdr no.1447;acc.no.14666)
Sanction dt. 30/09/1982(wdr no.1448;acc.no.15194)

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