APA
Gramchev T. V., Popivanov P. R., . (2000). Partial differential equations: Approximate solutions in sca. Berlin: Wiley-VCH.
Chicago
Gramchev Todor V, Popivanov Petar R, . 2000. Partial differential equations: Approximate solutions in sca. Berlin: Wiley-VCH.
Harvard
Gramchev T. V., Popivanov P. R., . (2000). Partial differential equations: Approximate solutions in sca. Berlin: Wiley-VCH.
MLA
Gramchev Todor V, Popivanov Petar R, . Partial differential equations: Approximate solutions in sca. Berlin: Wiley-VCH. 2000.