In order to introduce to the problem we follow one dimensional example given in reference [154]: (10.1) % MathType!MTEF!2!1!+- % feaaguart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaWaaSaaaeaaca % WGKbaabaGaamizaiaadIhaaaWaamWaaeaacaWGHbGaaiikamaalaaa % baGaamiEaaqaaiabew7aLbaacaGGPaWaaSaaaeaacaWGKbGaamyDaa % qaaiaadsgacaWG4baaaaGaay5waiaaw2faaiabg2da9iaadghacaGG % OaGaamiEaiaacMcaaaa!47E1! $$\frac{d}{{dx}}\left[ {a(\frac{x}{\varepsilon })\frac{{du}}{{dx}}} \right] = q(x)$$ , (10.2) % MathType!MTEF!2!1!+- % feaaguart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyDaiabg2 % da9iaaicdacaaMc8UaaGPaVlaaykW7ieaacaWFMbGaa83Baiaa-jha % caaMc8UaaGPaVlaaykW7caWG4bGaeyypa0JaaGimaiaacYcacaWGSb % aaaa!491F! $$u = 0\,\,\,for\,\,\,x = 0,l$$ .