Matches in DBpedia 2015-10 for { ?s ?p <http://books.google.it/books?id=i-uAucjb3h0C&pg=PA31&dq=Ivan+Georgievich+Petrowsky+and+Partial+Differential+Equations#v=onepage&q=Ivan%20Georgievich%20Petrowsky%20and%20Partial%20Differential%20Equations&f=false> }
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