?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.relation=http%3A%2F%2Facta.bibl.u-szeged.hu%2F42193%2F&rft.title=Positive+solutions+for+singular+m-point+boundary+value+problems+with+sign+changing+nonlinearities+depending+on+x&rft.creator=+Ma+Ya&rft.creator=+Yang+Baoqiang&rft.date=2009&rft.type=Foly%C3%B3irat&rft.type=NonPeerReviewed&rft.format=part&rft.language=hu&rft.identifier=http%3A%2F%2Facta.bibl.u-szeged.hu%2F42193%2F1%2Fejqtde_2009_043_001-014.pdf&rft.identifier=+++Ma+Ya%3B++Yang+Baoqiang%3A+++Positive+solutions+for+singular+m-point+boundary+value+problems+with+sign+changing+nonlinearities+depending+on+x.++(2009)+++