Valijonova, S. N-TARTIBLI CHIZIQLI O‘ZGARMAS KOEFFITSIYENTLI BIR JINSLI BO‘LMAGAN DIFFERENSIAL TENGLAMALARNI ANIQMAS KOEFFITSIYENTLAR USULIDA YECHISH. YD 2026, 2 (8), 6-9. https://doi.org/10.47390/ydif-y2026v2i8/n01.