Linked from
The 14 pages that link to Spontaneous fission, each with the reason it gives.
SeaborgiumRelated: Some seaborgium isotopes can end their decay sequences by fissioning.
RutherfordiumBroader topic: It competes with alpha decay in some heavy rutherfordium isotopes.
DubniumRelated: Some dubnium isotopes end their decay chains by fissioning.
RoentgeniumRelated: Some roentgenium isotopes can end their decay chains by fissioning.
NobeliumRelated: Some nobelium isotopes are identified by their characteristic fission events.
BohriumRelated: Some bohrium decay chains terminate in spontaneous fission.
UnquadseptiumRelated: It could compete with other decay modes in a hypothetical nucleus this heavy.