Anneliese Schauerte. Normality for biframes. Applied Categorical Structures, 3(1):1-9, 1995. [doi]
@article{Schauerte95, title = {Normality for biframes}, author = {Anneliese Schauerte}, year = {1995}, doi = {10.1007/BF00872946}, url = {http://dx.doi.org/10.1007/BF00872946}, researchr = {https://researchr.org/publication/Schauerte95}, cites = {0}, citedby = {0}, journal = {Applied Categorical Structures}, volume = {3}, number = {1}, pages = {1-9}, }