[1]
Knudsen, J.L., Madsen, O.L., Nørgaard, C., Petersen, L.B. and Sandvad, E. 1990. Teaching object-oriented programming using BETA. DAIMI Report Series. 19, 312 (Apr. 1990). DOI:https://doi.org/10.7146/dpb.v19i312.6559.