TY - JOUR TI - A Lyapunov functional for a retarded differential equation PY - 1985 AU - Oliveira, José Carlos Fernandes de AU - Carvalho, Luiz Antonio Vieira de T2 - Siam Journal on Mathematical Analysis SN - 0036-1410 DO - 10.1137/0516093 UR - https://doi.org/10.1137/0516093 PP - Philadelphia, PA VL - 16 IS - 6 SP - 1295-1305 ER -