Preface
Differential and Integral Equations, GDML_Books, (1979), p. 7 / Harvested from
Access to full text
Full (PDF) 
@inbook{400394,
     title = {Preface},
     booktitle = {Differential and Integral Equations},
     series = {GDML\_Books},
     publisher = {Academia},
     address = {Praha},
     year = {1979},
     pages = {7-7},
     url = {http://dml.mathdoc.fr/item/400394}
}

 (éd.). Preface, dans Differential and Integral Equations, GDML_Books,  (1979), p. 7. http://gdmltest.u-ga.fr/item/400394/