00497nam a22001697a 4500 OSt 20230814132808.0 230814b |||||||| |||| 00| 0 eng d 9783110677249 515.353 T58P Tolstykh, Vladimir A. Partial Differential Equations : an unhurried introduction by Vladimir A. Tolstykh Berlin Walter dr Gruyter 2020 x; 266 p. Differential equations, Partial ddc BK 26523 26523 0 0 0 0 TXB CURAJ CURAJ 2023-08-14 MTH 1 515.353 T58P 40275 2025-08-07 2025-07-24 2023-08-14 BK