% =====================================================================
%  ch-04.additions.bib — New entries for Chapter 4: The Fibrant Self
%  Style: apalike. Title case-protection uses braces only where
%  apalike's lowercasing would damage a proper noun.
% =====================================================================

% --- Boone: independent (with Novikov) proof of word-problem unsolvability ---
@article{boone1959,
  author  = {Boone, William W.},
  title   = {The Word Problem},
  journal = {Annals of Mathematics},
  volume  = {70},
  number  = {2},
  pages   = {207--265},
  year    = {1959}
}

% --- Weisgerber: co-developer (with Trier) of the Wortfeld theory ---
@book{weisgerber1962,
  author    = {Weisgerber, Leo},
  title     = {Grundz\"uge der inhaltbezogenen Grammatik},
  publisher = {Schwann},
  address   = {D\"usseldorf},
  year      = {1962},
  edition   = {3rd}
}

% --- Vietoris: original construction underlying the Vietoris-Rips complex ---
@article{vietoris1927,
  author  = {Vietoris, Leopold},
  title   = {\"Uber den h\"oheren Zusammenhang kompakter R\"aume und eine Klasse von zusammenhangstreuen Abbildungen},
  journal = {Mathematische Annalen},
  volume  = {97},
  number  = {1},
  pages   = {454--472},
  year    = {1927}
}
