• Graphical sequent calculi for modal logicsMa, Minghui; Pietarinen, Ahti-VeikkoElectronic proceedings in theoretical computer science2017 / p. 91-103 https://doi.org/10.4204/EPTCS.243.7 https://www.scopus.com/sourceid/21100244944 https://www.scopus.com/record/display.uri?eid=2-s2.0-85018895900&origin=inward&txGid=017e9495e88129b44be81d9119238efe https://www.webofscience.com/wos/woscc/full-record/WOS:000405453900008