Não informado. (1988). Differential and integral equations. Ohio University, Department of Mathematics.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Differential and Integral Equations. Athens, Ohio: Ohio University, Department of Mathematics, 1988.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Differential and Integral Equations. Ohio University, Department of Mathematics, 1988.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.