Nemytskii, V. V. 1., Stepanov, V. V. 1., Stepanov, V. V., Stepanov, V. V. 1., Stepanov, V. V. 1., & Stepanov, V. V. (1989). Qualitative theory of differential equations. New York: Dover.
Παραπομπή Chicago StyleNemytskii, V. V. 1900-, V. V. 1889-1990 Stepanov, V. V. Stepanov, V. V. 1889-1950 Stepanov, V. V. 1889-1950 Stepanov, and V. V. Stepanov. Qualitative Theory of Differential Equations. New York: Dover, 1989.
Παραπομπή MLANemytskii, V. V. 1900-, et al. Qualitative Theory of Differential Equations. New York: Dover, 1989.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.