Elbert, Samuel H.. Puluwat Grammar. 1974. hh:g:Elbert:Puluwat
Geminates are "extremely fortis" in word-medial position, and "lenis" in word-initial position -- in Elbert's orthography, /náyiy + ppalúw/ 'my navigator' (with a lenis geminate) vs. /yappalúw/ 'teach navigation' (with a fortis geminate).