SIMBAD references

We show that if the inner regions of accretion discs in quiescent dwarf nova systems are removed by magnetic disruption or evaporated by siphon flows, the remaining disc is globally stable for mass transfer rates ≲10¹⁵g/s. This implies that (super)outbursts in these systems have to be triggered by an enhanced mass transfer from the companion. We suggest that the lack of normal outbursts in WZ Sge results only from its low mass transfer rate and that the viscosity in its disc does not have to be few orders of magnitude lower than in other quiescent dwarf novae.