def spw_filter(string):
    """Filter stopwords in a given string --> Titles of researchers' publications"""
    stopwords = ['i', 'me', 'my', 'myself', 'we', 'our', 'ours', 'ourselves', 'you', "you're",
                 "you've", "you'll", "you'd", 'your', 'yours', 'yourself', 'yourselves', 'he', 'him', 'his',
                 'himself', 'she', "she's", 'her', 'hers', 'herself', 'it', "it's", 'its', 'itself', 'they', 'them',
                 'their', 'theirs', 'themselves', 'what', 'which', 'who', 'whom', 'this', 'that', "that'll", 'these',
                 'those', 'am', 'is', 'are', 'was', 'were', 'be', 'been', 'being', 'have', 'has', 'had', 'having', 'do',
                 'does', 'did', 'doing', 'a', 'an', 'the', 'and', 'but', 'if', 'or', 'because', 'as', 'until', 'while',
                 'of', 'at', 'by', 'for', 'with', 'about', 'against', 'between', 'into', 'through', 'during', 'before',
                 'after', 'above', 'below', 'to', 'from', 'up', 'down', 'in', 'out', 'on', 'off', 'over', 'under',
                 'again', 'further', 'then', 'once', 'here', 'there', 'when', 'where', 'why', 'how', 'all', 'any',
                 'both', 'each', 'few', 'more', 'most', 'other', 'some', 'such', 'no', 'nor', 'not', 'only', 'own',
                 'same', 'so', 'than', 'too', 'very', 'can', 'cannot', 'will', 'just', "don't", 'should', "should've",
                 'now', "aren't", "couldn't", "didn't", "doesn't", "hadn't", "hasn't", "haven't", "isn't", "mightn't",
                 "mustn't", "needn't", "shan't", "shouldn't", "wasn't", "weren't", "won't", "wouldn't"]

    return [tk.strip() for tk in string.lower().split() if tk not in stopwords]