==Works==*"Cosmographia (1529) von Petrus Apianus", annotated by Gemma Frisius*"De principiis astronomiae et cosmographiae" (1530)*"De usu globi" (1530)*"Libellus de locorum describendorum ratione" (1533)*"Arithmeticae practicae methodus facilis" (1540)*"De annuli astronomici usu" (1540)*"De radio astronomico et geometrico" (1545)*"De astrolabio catholico" (1556)== Notes ==== Further reading ==* N. Haasbroek: "Gemma Frisius, Tycho Brahe and Snellius and their triangulations".
* "Cosmographia (1529) Петера Апиана", исправленная Геммой Фризиусом* "De principiis astronomiae et cosmographiae" (1530)* "De usu globi" (1530)* "Libellus de locorum describendorum ratione" (1533)* "Arithmeticae practicae methodus facilis" (1540)* "De annuli astronomici usu" (1540)* "De radio astronomico et geometrico" (1545)* "De astrolabio catholico" (1556)* Regnier Gemma Frisius