Recent "Tupi" papers (Years 2011 and 2012)
VARIATIONS OF THE MUON FLUX AT SEA LEVEL ASSOCIATED WITH INTERPLANETARY ICMEs AND COROTATING INTERACTION REGIONS.

Astrophysical Journal (Online), v. 759, p. 143, 2012. doi:10.1088/0004-637X/759/2/143
Search for a simultaneous signal from small transient events in the Pierre Auger Observatory and the Tupi muon telescopes.

Physical Review. D, Particles, Fields, Gravitation, and Cosmology, v. 86, p. 022001, 2012. DOI:10.1103/PhysRevD.86.022001
Connection among spacecrafts and ground level observations of small solar transient events.

Experimental Astronomy (Print), v. 32, p. 1-21, 2011. DOI 10.1007/s10686-011-9242-5
Muon excess at sea level from solar flares in association with the Fermi GBM spacecraft detector.

Physical Review. D, Particles, Fields, Gravitation, and Cosmology, v. 84, p. 042002-042002-10, 2011. DOI: 10.1103/PhysRevD.84.042002