Richard Hennig writes in his 'Terrae Incognitae, band IV' (1956) on the Cabo Verde islands. It's a book in German. In German these islands are called 'Kapverdische Inseln'. Here a scan of all the relevant pages.
Index on 'Kapverdische Inseln'
Main chapter (180) on the discovery ('entdeckung') of the first ('ersten') Cabo Verde islands. Page 163 - 184:
Main chapter (184) on the discovery ('entdeckung') of the western ('westlichen') Cabo Verde islands. Page 207 - 211:
Page 53 - 54 Green Islands ('Grünen Inseln') are not Cabo Verde islands. Seen by arabic sailors ('arabische seefahrer')
Page 112 'Salt-island' ('Salzinseln') is island Arguin and not Cabo Verde island Sal
Page 139 - 146 Oldest map with Cabo Verde on them is from Benincasa in 1468
Page 160 Cadamosto discovers the Cabo Verde islands after a storm
Page 196 The portuguese King gives a non-existing island to his sister Donna Britiz
Page 201 -202 Copper- or Stonepillars in the ocean
Page 366 - 367 Spanish relationships ('kastilische Beziehungen') to Cabo Verde islands
Link to a document (PDF) with the pages above in one document: here. Handy for reading on an e-reader or tablet.