TY - JOUR AU - Machacek, John TI - Boundary measurement and sign variation in real projective space JO - Annales de l’Institut Henri Poincaré D PY - 2022 SP - 543 EP - 565 VL - 9 IS - 3 UR - http://www.numdam.org/articles/10.4171/aihpd/125/ DO - 10.4171/aihpd/125 LA - en ID - AIHPD_2022__9_3_543_0 ER -