“…xlim=c (-180,180), ylim=c(-60, 90))+ scale_fill_continuous(low="thistle2", high="darkred", guide="colorbar") + #, labels="comma") scale_y_continuous(breaks=c()) + scale_x_continuous(breaks=c()) + labs(fill = "Número \nde sessões\n(em mil)", title="Acessos ao MIT OCW de 2008 a 2017", x="", y="") + theme_bw() + theme(legend.position="bottom", legend.box="horizontal", legend.key.width= unit(2, "cm"), 2010x x x x H. C. Davis et al (2010) x x x Kanwar, Kodhandaraman, & Umar (2010) x x x Thakrar, Zinn, & Wolfenden (2009) x x Ferreira (2009) x x x x x x Friesen (2009) x Lane (2009) Baker, Thierstein, Fletcher, Kaur, & Emmons (2009 x x x x x Arendt & Shelton (2009) x x Morgan & Carey (2009) x x x x x x x Weibel et al (2009) x x x x M. S. Smith (2009) Vera (2009 x Petrides, Nguyen, Kargliani, & Jimes (2008) Abelson (2008 x x x x Wilson (2008) x x x x x Caswell, Henson, Jensen, & Wiley (2008) x Lee, Lin, & Bonk (2007) x Oyo, Kalema, & Byabazaire (2017) x x x Hilton III, Fischer, Wiley, & Williams (2016) x x x x Cox & Trotter (2016) x x x Rapp, Gulbahar, & Adnan (2016) x x x x x Tabuenca, Kalz, Ternier, & Specht (2016) x x Suárez (2016) x 2017x Amiel & Soares 2016x Hu, Li, Li, & Huang (2015) x x Fischer, Hilton, Robinson, & Wiley (2015) x x x x x Lopez-Vargas, Piedra, Chicaiza, & Caro (2015) x Elf, Ossiannilsson, Neljesjö, & Jansson (2015) x x Law 2015x Vidal (2015) x x Ye, Recker, Walker, Leary, & Yuan (2015) x x…”