@misc{OBrienTowards,
  title = {Towards complex activity recognition: GPS-free localization and map generation on smartphones},
  author = {Casey J O’Brien and Sheikh Iqbal Ahamed},
  url = {https://iqbalahamed.com/publications/scholar-bfd60803fdfa221503a1b413},
  note = {Casey J O’Brien, Sheikh Iqbal Ahamed. Towards complex activity recognition: GPS-free localization and map generation on smartphones.}
}