Add ref to the discussion about disappearing ggvis plots
Add ref to the discussion about disappearing ggvis plots

MaayanLab/PAEA,MaayanLab/PAEA,MaayanLab/PAEA,MaayanLab/PAEA,nasb-course/nasb-microtask-viewer-shiny,nasb-course/nasb-microtask-viewer-shiny,MaayanLab/PAEA