Hollow-core slab - Wikipedia

File:Hollow core slabs.jpg - Wikimedia Commons

ARROW waveguide - Wikipedia

Historical Development of Hollow Core Slabs - Arnold Van Acker

Precast Hollowcore Floor Slabs - Fogarty Concrete

Concrete block - Wikipedia

Concrete slab - Wikipedia

Waffle Slab - Wikipedia, PDF, Architectural Design

Voided biaxial slab - Wikipedia

What Is a Hollow Core Slab? - Quick Facts

Concrete slab, Wikidwelling

Prestressed concrete - Wikipedia

Strong but slim concrete floors

Precast concrete - Wikipedia