For efficiency of ligaments between tube holes, see
Pt 5, Ch 10, 2.2 Efficiency of ligaments between tube holes.
For compensating effect of tube stubs, see
Pt 5, Ch 10, 2.3 Compensating effect of tube stubs.
For unreinforced
openings, see
Pt 5, Ch 10, 2.4 Unreinforced openings.
For reinforced openings, see
Pt 5, Ch 10, 2.5 Reinforced openings.