@article{AIF_1997__47_5_1425_0,
     author = {Dahlberg, Bj\"orn E. J. and Kenig, Carlos E. and Pipher, Jill and Verchota, G. C.},
     title = {Area integral estimates for higher order elliptic equations and systems},
     journal = {Annales de l'Institut Fourier},
     pages = {1425--1461},
     publisher = {Association des Annales de l{\textquoteright}institut Fourier},
     volume = {47},
     number = {5},
     year = {1997},
     doi = {10.5802/aif.1605},
     zbl = {0892.35053},
     mrnumber = {98m:35045},
     language = {en},
     url = {https://aif.centre-mersenne.org/articles/10.5802/aif.1605/}
}