TY - JOUR AU - Lilu Zhao TI - Four squares of primes and powers of 2 JO - Acta Arithmetica PY - 2014 SP - 255 EP - 271 VL - 162 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/aa162-3-4/ DO - 10.4064/aa162-3-4 LA - en ID - 10_4064_aa162_3_4 ER -