Conference – 2015 Equation (2)

y i t j i t + α k k i t + α l l i t . MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyEamaaBa aaleaacaWGPbGaamiDaaqabaGccqGHHjIUcaWGQbWaaSbaaSqaaiaa dMgacaWG0baabeaakiabgUcaRiabeg7aHnaaBaaaleaacaWGRbaabe aakiaadUgadaWgaaWcbaGaamyAaiaadshaaeqaaOGaey4kaSIaeqyS de2aaSbaaSqaaiaadYgaaeqaaOGaamiBamaaBaaaleaacaWGPbGaam iDaaqabaGccaGGUaaaaa@4C02@