@article{articlebc6a84cc,
title   = {Cyclical period changes in the dwarf novae V2051 Oph and V4140 Sgr},
author = {Baptista, R and Borges, B W and Bond, H E and Jablonski, F and Steiner, João Evangelista and Grauer, A D},
year = {2003},
doi = {10.1046/j.1365-8711.2003.07014.x},
journal   = {Monthly Notices of the Royal Astronomical Society}
}