GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it
@article{Neumann33,1author = {Bernd Neumann},2title = {Die {A}utomorphismengruppe der freien {G}ruppen},3journal = {Math. Annalen},4volume = 107,5year = 1933,6pages = {367--386} }78@article{BirgetEtAl00,9author = {J.-C. Birget and S. Margolis and J. Meakin and P. Weil},10title = {{PSPACE}-complete problems for subgroups of free groups11and inverse finite automata},12journal = {Theoretical Computer Science},13volume = 242,14year = 2000,15pages = {247--281} }1617@book{LyndonSchupp77,18author = {Roger C. Lyndon and Paul E. Schupp},19title = {Combinatorial Group Theory},20publisher = {Springer},21year = 1977 },2223@mastersthesis{Sievers03,24author = {Christian Sievers},25title = {Algorithmen f\accent127ur freie {G}ruppen},26school = {TU Braunschweig},27year = 2003,28type = {Diplomarbeit} }2930@article{Nielsen,31author = {J. Nielsen},32title = {Die {I}somorphismengruppe der freien {G}ruppen},33journal = {Math. Annalen},34volume = 91,35year = 1924,36pages = {169--209} }373839