Praveen S., Oliveira S. M., Borges J., and Mano J. F.,  "Assembly of cell-laden hydrogel fiber into non-liquefied and liquefied 3D spiral constructs by perfusion-based layer-by-layer technique",  Biofabrication, vol. 7, issue 1, pp. 011001-011007, doi:10.1088/1758-5090/7/1/011001, 2015.